pliss ada yg bisa jawab

Luas Segitiga = 1/2 alas * Tinggi
=1/2 alas * 12cm
=alas = Sisi miring^2 - tinggi^2
=alas = 21^2 - 12^2
=alas = 441 - 144
=akar297
=17akar4
luas Segitiga = 1/2 alas * Tinggi
=1/2 (17akar4) * 12
=8.5akar4 * 12
=68akar4cm2