Evaluate the expression when a=−15 and b=−5. b2/a + 5
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Answer:
Step-by-step explanation:
Big circle:
R = radius = diameter ÷2 = 42 ÷ 2 = 21 cm
Area of big circle= πR²
Small circle:
Diameter of small circle = radius of big circle = 21 cm
r = 21/2 = 10.5 cm
Area of small circle = πr²
Area of shaded region = area of big circle - area of small circle
= 1386 - 346.5
= 1039.5 cm²