4(9+7) = 36+28 = 64
open the parentheses, then simplify.
3,800
because the rectangle area is 40x70 plus the triangle area is 40x50 divided by 2
3. Both are supplementary to angle BCE
4. Angle 2 = Angle 1
Answer:
78
Step-by-step explanation:
∠A + ∠B + ∠C = 180 { Angle sum property of triangle}
42 + ∠B + 60 = 180
∠B + 102 = 180
∠B = 180 - 102 = 78
In similar triangles, corresponding angles are congruent.
∠S ≅ ∠B
∠S = 78°
