Question

Calculați aria triunghiulu DEF cu m(D)=90° daca :
DE=10cm
DF=13 cm
Plssss

Answer 1

A=(DE*DF)/2=10*13/2=65cm²

Answer 2

$\it \mathcal{A} =\dfrac{c_1\cdot c_2}{2} =\dfrac{DE\cdot DF}{2} =\dfrac{10\cdot 13}{2} =5\cdot13 = 65\ cm^2$