angkanya 17 alas yang garis tipis 6 tinggi 8

√17² - 8²
√289 - 64
= 15 cm

L segitiga PRS= 1/2 a x t
                  = 1/2 15 x 8
                  = 60 cm²
L segitiga QRS= 1/2 a x t
                        = 1/2 6 x 8
                        = 24 cm²
L segitiga PQR= 60 - 24
                        = c. 36 cm²