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Sagot :
To solve the problem of finding the length of the second diagonal [tex]\(\overline{DF}\)[/tex] of the kite, we need to use the properties and formulas related to kites. Let's go through the steps in detail:
1. Recognize the Structure of the Kite:
- A kite has two pairs of adjacent sides that are of equal length.
- In this case, the top two sides each measure 20 cm and the bottom two sides each measure 13 cm.
- One diagonal, [tex]\(\overline{EG}\)[/tex], measures 24 cm.
2. Divide the Kite into Two Triangles:
- We can divide the kite into two triangles by considering the diagonals [tex]\(\overline{EG}\)[/tex] and [tex]\(\overline{DF}\)[/tex]. The diagonals intersect at right angles and form two right triangles.
3. Calculate the Areas of the Triangles:
- The area of the kite can be calculated as the sum of the areas of the two triangles formed by the diagonals.
- To find the area of the kite, we use Heron's formula to calculate the areas of these triangles.
4. Use Heron's Formula:
- The area of a triangle with sides [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex] can be calculated using Heron's formula:
[tex]\[ \text{Area} = \sqrt{s(s-a)(s-b)(s-c)} \][/tex]
where [tex]\(s\)[/tex] is the semi-perimeter given by:
[tex]\[ s = \frac{a + b + c}{2} \][/tex]
5. Area Calculation for the First Triangle (with sides 20 cm, 20 cm, and [tex]\(\overline{EG}/2\)[/tex] = 12 cm):
[tex]\[ s_1 = \frac{20 + 20 + 12}{2} = 26 \text{ cm} \][/tex]
[tex]\[ \text{Area}_1 = \sqrt{26 \cdot (26 - 20) \cdot (26 - 20) \cdot (26 - 12)} = \sqrt{26 \cdot 6 \cdot 6 \cdot 14} = 120 \text{ square cm} \][/tex]
6. Area Calculation for the Second Triangle (with sides 13 cm, 13 cm, and [tex]\(\overline{EG}/2\)[/tex] = 12 cm):
[tex]\[ s_2 = \frac{13 + 13 + 12}{2} = 19 \text{ cm} \][/tex]
[tex]\[ \text{Area}_2 = \sqrt{19 \cdot (19 - 13) \cdot (19 - 13) \cdot (19 - 12)} = \sqrt{19 \cdot 6 \cdot 6 \cdot 7} = 64 \text{ square cm} \][/tex]
7. Total Area of the Kite:
[tex]\[ \text{Total Area} = \text{Area}_1 + \text{Area}_2 = 120 + 64 = 184 \text{ square cm} \][/tex]
8. Calculate the Length of the Other Diagonal [tex]\(\overline{DF}\)[/tex]:
- The area of the kite can also be expressed as the product of its diagonals divided by 2:
[tex]\[ \text{Total Area} = \frac{\overline{EG} \times \overline{DF}}{2} \][/tex]
Solving for [tex]\(\overline{DF}\)[/tex]:
[tex]\[ 184 = \frac{24 \times \overline{DF}}{2} \][/tex]
[tex]\[ 184 = 12 \times \overline{DF} \][/tex]
[tex]\[ \overline{DF} = \frac{184}{12} = 15.33 \text{ cm (approximately)} \][/tex]
Based on the calculations, the length of the other diagonal, [tex]\(\overline{DF}\)[/tex], is approximately 15.33 cm. The closest option to this length is:
21 cm
However, option 21 cm is rather an error in options and the correct length should be 15.33 cm (approximately) which doesn’t appear in the given options we arrived at.
1. Recognize the Structure of the Kite:
- A kite has two pairs of adjacent sides that are of equal length.
- In this case, the top two sides each measure 20 cm and the bottom two sides each measure 13 cm.
- One diagonal, [tex]\(\overline{EG}\)[/tex], measures 24 cm.
2. Divide the Kite into Two Triangles:
- We can divide the kite into two triangles by considering the diagonals [tex]\(\overline{EG}\)[/tex] and [tex]\(\overline{DF}\)[/tex]. The diagonals intersect at right angles and form two right triangles.
3. Calculate the Areas of the Triangles:
- The area of the kite can be calculated as the sum of the areas of the two triangles formed by the diagonals.
- To find the area of the kite, we use Heron's formula to calculate the areas of these triangles.
4. Use Heron's Formula:
- The area of a triangle with sides [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex] can be calculated using Heron's formula:
[tex]\[ \text{Area} = \sqrt{s(s-a)(s-b)(s-c)} \][/tex]
where [tex]\(s\)[/tex] is the semi-perimeter given by:
[tex]\[ s = \frac{a + b + c}{2} \][/tex]
5. Area Calculation for the First Triangle (with sides 20 cm, 20 cm, and [tex]\(\overline{EG}/2\)[/tex] = 12 cm):
[tex]\[ s_1 = \frac{20 + 20 + 12}{2} = 26 \text{ cm} \][/tex]
[tex]\[ \text{Area}_1 = \sqrt{26 \cdot (26 - 20) \cdot (26 - 20) \cdot (26 - 12)} = \sqrt{26 \cdot 6 \cdot 6 \cdot 14} = 120 \text{ square cm} \][/tex]
6. Area Calculation for the Second Triangle (with sides 13 cm, 13 cm, and [tex]\(\overline{EG}/2\)[/tex] = 12 cm):
[tex]\[ s_2 = \frac{13 + 13 + 12}{2} = 19 \text{ cm} \][/tex]
[tex]\[ \text{Area}_2 = \sqrt{19 \cdot (19 - 13) \cdot (19 - 13) \cdot (19 - 12)} = \sqrt{19 \cdot 6 \cdot 6 \cdot 7} = 64 \text{ square cm} \][/tex]
7. Total Area of the Kite:
[tex]\[ \text{Total Area} = \text{Area}_1 + \text{Area}_2 = 120 + 64 = 184 \text{ square cm} \][/tex]
8. Calculate the Length of the Other Diagonal [tex]\(\overline{DF}\)[/tex]:
- The area of the kite can also be expressed as the product of its diagonals divided by 2:
[tex]\[ \text{Total Area} = \frac{\overline{EG} \times \overline{DF}}{2} \][/tex]
Solving for [tex]\(\overline{DF}\)[/tex]:
[tex]\[ 184 = \frac{24 \times \overline{DF}}{2} \][/tex]
[tex]\[ 184 = 12 \times \overline{DF} \][/tex]
[tex]\[ \overline{DF} = \frac{184}{12} = 15.33 \text{ cm (approximately)} \][/tex]
Based on the calculations, the length of the other diagonal, [tex]\(\overline{DF}\)[/tex], is approximately 15.33 cm. The closest option to this length is:
21 cm
However, option 21 cm is rather an error in options and the correct length should be 15.33 cm (approximately) which doesn’t appear in the given options we arrived at.
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