Question

PLEASE PLEASE HELP ME

Answer 1

Go through second method

Area of one traingle'-

• 1/2(1.5)4
• 2(1.5)
• 3cm²

Area of two triangles=6cm²

Area of rectangle

• (15-4)(3)
• 11(3)
• 33cm²

Total:-

• 33+6
• 39cm²

Answer 2

Method 1

Find the area of the rectangle, 45 cm². Subtract the area of the cut-out triangle from the rectangle, 45 - 6 = 39 cm²

Method 2

Separate the ribbon into two triangles and a rectangle.

33 + 3 + 3 = 39 cm²

Explanation:

Formulae

• Area of a rectangle = width × length
• Area of a triangle = 1/2 × base × height

Method 1

Area of the rectangle:

= 3 × 15

= 45 cm²

Area of the cut-out triangle:

= 1/2 × 3 × 4

= 6 cm²

Find the area of the rectangle, 45 cm². Subtract the area of the cut-out triangle from the rectangle, 45 - 6 = 39 cm²

Method 2

Area of the rectangle:

= 3 × (15 - 4)

= 3 × 11

= 33 cm²

Area of one triangle:

= 1/2 × (3 ÷ 2) × 4

= 3 cm²

Separate the ribbon into two triangles and a rectangle.

33 + 3 + 3 = 39 cm²