luas segitiga pqr adalah... a.21 cm2 b.30 cm2 c.35 cm2 d.50 cm2

Langsung aja y

luas ∆ PSR
a = √15² - 7²
a = √225 - 49
a = √176
a = 13,3 cm

= ½ × a × t
= ½ × 13,3 × 7
= 46,55 cm²
= 47 cm²

luas ∆ QSR
= ½ × a × t
= ½ × 4 × 7
= 14 cm²

luas ∆ PQR
= 47 - 14
= 33 cm²

semoga berguna +_+