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Copy the figure at right. Calculate the measure
of each lettered angle. Explain
how you determined the
measures d and h.


Copy The Figure At Right Calculate The Measure Of Each Lettered Angle Explain How You Determined The Measures D And H class=

Sagot :

The angles of each letter are as follows:

∠a = 124°

∠b = 56°

∠c = 56°

∠d  = 38°

∠e = 38°

∠f  =  76°

∠g  = 66°

∠h = 104°

∠k = 76°

∠n = 86°

∠p = 38°

∠a = 180 - 56 = 124°(total angle on a straight line)

∠b = 56°(vertically opposite angles)

∠c = 56°(corresponding angle to ∠b) Note this is possible because there are 2 parallel lines and a transversal.

2∠d + ∠d + 66 = 180 (sum of angles in a triangle)

3∠d = 180 - 66

3∠d = 114

∠d = 114 / 3

∠d  = 38°

∠d  = ∠e (given)

Therefore,

∠e = 38°

∠d + 66 + ∠f = 180

38 + 66 + ∠f  = 180

∠f  =  76°

Recall external angle of a triangle is equals to the sum of the opposite angles. Therefore,

∠f  + ∠g  = ∠d + ∠h

∠f  + ∠g  = 38 + 104

76 + ∠g  = 142

∠g  = 66°

∠d  is one of the base angles of an isosceles triangle. Therefore base angles of the isosceles triangle are equal. This means the other base angle opposite ∠d in the isosceles triangle is congruent to ∠d.

Therefore,

2∠d + ∠h = 180(sum of angles in a triangle)

76 + ∠h = 180

∠h = 180 - 76

∠h = 104°

∠h + ∠k = 180 (sum of angles on a straight line)

∠k = 76°

∠n = 180 - ∠d - ∠c (angles on a straight line)

∠n = 86°

∠p = 180 - 56 - ∠n (sum of angle in a triangle)

∠p = 38°

Therefore, the angles of the letters are:

∠a = 124°

∠b = 56°

∠c = 56°

∠d  = 38°

∠e = 38°

∠f  =  76°

∠g  = 66°

∠h = 104°

∠k = 76°

∠n = 86°

∠p = 38°

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