tolong kaka bantuin semoga bisa

Trigonometri
- Luas Segitiga

a = b = c = 20 cm

S = ½(a + b + c)
= ½ (20 + 20 + 20)
= 30

[tex] L = \sqrt{S(S - a)(S - b)(S - c)} \\
L = \sqrt{30(30 - 20)(30 - 20)(30 - 20)} \\
L = \sqrt{30 \times 1000} [/tex]
L ≈ 173 , 2 cm²