Question

am nevoie de ajutor la cele 4 exercitii
dau coroana

Answer 1

1. ΔEDF - dreptunghic

Teorema lui Pitagora⇒EF²=ED²+DF²⇒100=36+DF²⇒DF²=100-36⇒DF²=64⇒DF=√64⇒DF=8

2. Teorema inaltimii

AD²=BD*DC⇒16=BD*2⇒BD=8

3.Teorema catetei

AC²=DC*BC⇒AC²=2*9⇒AC²=18⇒AC=√18⇒AC=3√2

4. Formula lui Heron

p=(MN+NP+MP):2

p=(3+4+5):2

p=12:2

p=6

A=√p(p-a)(p-b)(p-c)

A=√6(6-3)(6-4)(6-5)

A=√6*3*2*1

A=√36

A=6