Answer:
1.
S park = π × 70² = 4900πm² (S= πr² )
S fountain = π × 5² = 25πm²
=The total walking area = 4900π - 25π = 4875 π m²
2.
I need 2 × π × 4.5 materials. (C = 2πr)
=The area of the pond is π × 4.5² = 20.25π m²
3.
The radius is 150 ÷ 2 = 75cm. (d=2r)
=The area of the space is π × 75² = 5625π cm²
4.
The area is π × 48² = 2304π m²
= So she needs 2304π m² materials
5.
The radius of the clock is 75 ÷ π ÷ 2 = 75/2π cm. (r = c/2π)
= So the area is π × (75/2π)² = 5625/4π cm²
Step-by-step explanation:
hope it helps
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