Question

Pls answer these two questions
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Answer 1

Answer:

1. 1/2*20*4

10*4

40

2. 2*22/7*2

42.57

Answer 2

Step-by-step explanation:

Q1. given: (a)²+(b)²+(c)²= 800

and we know (a)²+(b)²=(c)²

a²+b²+c² = 2c² [adding c² on both side]

800 = 2c² [as sum of a² b² c² is 800]

c²= 800/2

c=√400

c= 20

Q2. first take area of circle i.e.

= π r²

= π (2)² = 12.56 cm²

then take area of sector

= 90/360×π×r²

= π × 2²/4

= 3.14 cm²

area of that square on top

= a²

= 2²

= 4 cm²

area remaining in circle

= area of circle - area of sector

= 12.56 - 3.14

= 9.42 cm²

area added on top by square

= area of square - area of sector

= 4 - 3.14

= 0.86 cm²

total area of shaded region

= 9.42 + 0.86

= 10.28