Sagot :
Answer:
- 144 cm²
- 13 m²
- 60 ft²
Step-by-step explanation:
1. a=15²-9²
=225-9²
=225-81
=144 cm²
2. a=½(6×7)-(4×2)
=½(42)-(4×2)
=21-(4×2)
=21-8
=13 m²
3. a=(7×12)-(8×3)
=84-(8×3)
=84-24
=60 ft²
Answer:
Step-by-step explanation:
1. a=15²-9²
=225-9²
=225-81
=144 cm²
2. a=½(6×7)-(4×2)
=½(42)-(4×2)
=21-(4×2)
=21-8
=13 m²
3. a=(7×12)-(8×3)
=84-(8×3)
=84-24
=60 ft²