Question

Perhatikan gambar 4.59Panjang PS=10cm, RS=24,dan QR = 30cm,hitunglah panjang PS,panjangQS,keliling segitiga PQR,luas segitiga PQR dan panjang jari-jari lingkaran dalam segita PQR

Answer 1

▶▶PR = √PS² + √RS²
= √10² + √24² = 26

▶▶QS = √QR² - √RS²
= √30² - √24² = 18

▶▶K PQR = PQ + QR + RP
PQ = 18 + 10 = 28
K = 28 + 30 + 26 = 84

▶▶s = a+b+c/2
s = 26+28+30/2 = 42
L = √42(42-26)(42-28)(42-30)
L = 336


▶▶r = L/s
r = 336/42 = 8