Respuesta :

sfkaleho
A. 20

Sims angles C and B are each 80 degrees, angle A must be 20 degrees
wegnerkolmp2741o

Answer:

20

Step-by-step explanation:

The <C in the triangle and 100 make a straight line  so they add to 180

<C + 100 = 180

<C = 80

<B = <C  since this is an isosceles triangle and they are the base angles

<A + <B + <C = 180 since the angles of a triangle add to 180

<A + 80 + 80 = 180

Combine like terms

<A +160 = 180

Subtract 160 from each side

<A +160-160 = 180-160

<A =20