1) tentukan -nilai r=sr -panjang AC - panjang BC 2) tentukan - nilai X -panjang DE -panjang DF Tolong jawab pakai cara y kak

jawab

1. (3x)^2 +(4x)^2 = (20)^2
9x^2 + 16x^2 = 400
25 x^2 = 400
x^2 = 16
x =  4

AC= 3x = 3(4) = 12
BC = 4x = 4(4) = 16


2. 
(x+1)^2 + (12)^2 = (x+7)^2
x^2 + 2x + 1 + 144= x^2 + 14x + 49
2x + 145 = 14x + 49
-12 x = - 96
x = 8
DF= x+1  = 8+1 = 9
DE = x + 7 = 8+7= 15