Angles ABC and CBD are complementary - they add up to 90°. This means
(4x + 52°) + (8x - 10°) = 90°
Solve for x :
12x + 42° = 90°
12x = 48°
x = 4°
It follows that angle CBD has measure
4 • 4° + 52° = 16° + 52° = 68°
Basically just do the problem backwards.
72÷9=8
72÷8=9
Answer:
125.66 cm²
Step-by-step explanation:
pi × (7² - 3²)
40pi cm²
125.6637061 cm²
