Answer:
130.5 cm²
Step-by-step explanation:
1) total length = 60 cm
Divided in ratio 7 : 3, it's like it was divided on 7+3=10 pieces, and then were taken 7 pieces and 3 pieces.
60: 10 = 6 cm
6*7 = 42 cm big piece
6*3= 18 cm small piece
2) It was made squares.
A square has 4 equal sides, so
42 : 4 = 10.5 cm is a side of the large square,
18: 4 = 4.5 cm is a side of the small square
3) Area of the square = side²
Area of the large square = (10.5)² = 110.25 cm²
Area of the small square = (4.5)² = 20.25 cm²
4) Total area of both squares
110.25 + 20.25 = 130.5 cm²
