Question

19 find the area of each triangle and choose the appropriate result.
triangle | 100 | 8 | 10 | 50 | 20
triangle 1 image: base 4 m, height 5 m | checkbox | checkbox | checkbox | checkbox | checkbox
triangle 2 image: base 8 ft, height 2 ft | checkbox | checkbox | checkbox | checkbox | checkbox
triangle 3 image: right triangle, legs 10 m and 10 m | checkbox | checkbox | checkbox | checkbox | checkbox

Explanation:

Step1: Recall triangle area formula

The formula for the area of a triangle is $A = \frac{1}{2} \times base \times height$.

Step2: Calculate area of first triangle

For the first triangle, base = 4 m, height = 5 m.
$A_1 = \frac{1}{2} \times 4 \times 5 = 10$ square meters.

Step3: Calculate area of second triangle

For the second triangle, base = 8 ft, height = 2 ft.
$A_2 = \frac{1}{2} \times 8 \times 2 = 8$ square feet.

Step4: Calculate area of third triangle

For the third triangle (right triangle), base = 10 m, height = 10 m.
$A_3 = \frac{1}{2} \times 10 \times 10 = 50$ square meters.

Answer:

• First triangle (4m base, 5m height): Area = 10, so mark the column "10".
• Second triangle (8ft base, 2ft height): Area = 8, so mark the column "8".
• Third triangle (10m base, 10m height): Area = 50, so mark the column "50".