Plis kak bantuin jawabin kak!!dikumpulkan besok pagi kak ini!!!ayo lah kak pliss!!!
Jawaban:
2. 60 cm²
3. panjang a= 40 cm
panjang b= 24 cm
panjang c= 56 cm
Penjelasan dengan langkah-langkah:
2. PR + PQ + RQ = 40 cm
(x+8) + (x+1) + (2x+3) = 40 cm
4x + 12 = 40
4x = 40 – 12
4x = 28
x = 28/4
x = 7
- PR = x + 8
PR = 7 + 8
PR = 15 cm
- PQ = x + 1
PQ = 7 + 1
PQ = 8 cm
- RQ = 2x + 3
RQ = 2.7 + 3
RQ = 14 + 3
RQ = 17 cm
Luas ∆PQR
= 1/2.PQ.PR
= 1/2.8.15
= 4.15
= 60 cm²
3. a : b : c = 5 : 3 : 7
Keliling = 120 cm
120 = 5 + 3 + 7
120 = 15
120/15 = 8 cm
Panjang a = 8 x 5 = 40 cm
Panjang b = 8 x 3 = 24 cm
Panjang c = 8 x 7 = 56 cm
semoga membantu 🙂