Ответ:
1) 8.67 cm
2) 8.89 cm
3) 3.5 cm
4) 2.05 cm
Объяснение:
1) +-2a*bcos80°=25+64-2*5*8*cos80°=8.67^2
2) 100+49-2*10*7cos60° = 8.89^2
3) 4+16-2*2*4cos61° = 3.5^2
4) 9+16-2*3*4*cos30° = 2.05^2
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Answers & Comments
Ответ:
1) 8.67 cm
2) 8.89 cm
3) 3.5 cm
4) 2.05 cm
Объяснение:
1) +-2a*bcos80°=25+64-2*5*8*cos80°=8.67^2
2) 100+49-2*10*7cos60° = 8.89^2
3) 4+16-2*2*4cos61° = 3.5^2
4) 9+16-2*3*4*cos30° = 2.05^2