tolong bantu pake cara ya​

Penjelasan dengan langkah-langkah:

1). s = 40/4 = 10 cm

2) s = √64 = 8 cm

3) Keliling = 2 x (12 + 120/12) = 44 cm

4) lebar = 142/2 – 42 = 29 cm

5) Luas ∆ = 10 x 8/2 = 40 cm²

6) Luas ∆ = 25 x 20/2 = 250 cm²

7) tinggi ∆ = 18×2/4 = 9 cm

8) Keliling = 2(18+7) = 50 cm

9) Keliling = 2(8+5) = 26 cm

10) panjang = 40/2 – 8 = 12 cm