Question

Cum calculez aria unui romb cu diagonalele de 6 si 12 cm
Cum calculez aria unui triunghi echilateral cu o latura de 6 cm
Cum calculez aria unu triunghi dreptunghic cu catetele de 8 si 16 cm ​

Answer 1

$A_{romb}=\frac{d_1\cdot d_2}{2} =\frac{6\cdot12}{2} =6\cdot6=36\,cm^2$

$A_{\bigtriangleup\:echilateral}=\frac{l^2\sqrt{3} }{4} =\frac{6^2\sqrt{3} }{4} =\frac{36\sqrt{3} }{4} =9\sqrt{3} \,cm^2$

$A_{\bigtriangleup\:dreptunghic}=\frac{c_1\cdot c_2}{2} =\frac{8\cdot16}{2} =8\cdot8=64\,cm^2$