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binamaksimchuk

Ответ:

Объяснение:

S=ah

S=1/2×22×15= 165 см²

2

S=1/2 ab=1/2×9×4=18 см²

3

CB=1/2AB=1/2×20= 10 см

S=1/2CB×AC=1/2×10×12=60 см²

4

26²=2AC²

AC²=676/2=338

S=1/2×338=169 см²

5

AC=8 см ,HC=1/2AC=1/2×8=4 см,

<HBC=1/2<B=1/2×60°=30°

BC=2HC=2*4=8 см

BH=√BC²-HC²=√8²-4²=√64-16=√48=4√3 см

S=1/2BH×AC=1/2×4√3×8=16√3 см²

6

<BMC=180°-<BMA=180°-135°=45°

BC=MC= 10 см

AC=AM+MC=6+10=16 см

S=1/2AC×BC=1/2×16×1O=80 см²

8

p=(13+14+15)÷2=21 см

S = √p(p - a)(p - b)(p - c)=√21(21 - 13)(21 - 14)(21- 15)=√21×8×7×6=√7056=84 см²

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