Question

what is area of sector which is 90°, radius=7cm​

Answer 1

Answer:

51.3 cm²

Step-by-step explanation:

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Answer 2

Answer:

38.5 cm²

Step-by-step explanation:

θ = 90°

r = 7 cm

Area of sector: $\frac{θ}{360°}$ × πr²

⇒ $\frac{90°}{360°}$ × $\frac{22}{7}$ × (7)²

⇒ $\frac{1}{4}$ × $\frac{22}{7}$ × 49

⇒ $\frac{1}{2}$ × 11 × 7

⇒ $\frac{77}{2}$

⇒ 38.5 cm²