Question

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Answer 1

Объяснение:

1) S = a $\sqrt{d^{2} -a^{2} }$ = 8 $\sqrt{100-64}$ = 8 $\sqrt{36}$ = 8*6=48  

2) S = (a²√3)/4 = ((3√3)²×√3)/4 = 27√3/4

3) S = a*h = 10*4 = 40

4) S = a*b*sinα = 6*8*sin 150° = 48*1/2 = 24

5) a²+b² - c²

b = √c² - a² = √225-81 = √144 = 12

S = 1/2ab = 1/2*9*12 = 54

6) S = d²/2 = 6²/2 = 36/2 = 18

7) S = 1/2$d_{1} d_{2}$ = 1/2*14*12 = 84

d - диагональ