tolong bantu saya no.5.

RQ = 40 cm
SP = 7 cm
RS = 24 cm
PQ = 25 cm

A.Luas Δ PQR
L = √s(s-a)(s-b)(s-c)
   = √45(45 -25)(45-25)(45-40)
   = √45 × 20 × 20 × 5
   = √225  × 20 × 20
   = √225 × 400
   = √90000
   = 300 cm²
s = 1/2 keliling

B.Luas Δ PRS
L =  1/2 (a×t)
   = 1/2 ( 7×24)
   = 1/2 × 168
   = 84 cm²

C.Panjang PT
T = L ÷ (A × 1/2 )
   = 300 cm ÷ (40 × 1/2)
   = 300 cm ÷ 20 cm
   = 15 cm