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B728CB (angle B)=a (side a)=b (side b)=Blank 1:Blank 2:Blank 3:

Sagot :

Since angle A is 28° and angle C is 90° and the sum of three angles must be 180° we can deduce the angle B is equal to 62°

We can use the the function sine to calculate the length of side a, as we can see in the following equation

[tex]\sin (28)=\frac{a}{7}[/tex]

Isolating a we have a = sin(28)*7 = 3.3 solving, we obtain Side a= 3.3

then I calculate the side b with the function cosine

[tex]\cos (28)=\frac{b}{7}[/tex]

Isolating b we have b= cos(28)*7 = 6.2, solving, we obtain Side b=6.2

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