Question

find the area of a triangle with a base of 4 cm and a height of 5 cm. 11 cm 16 cm 10 cm 72cm

Explanation:

Step1: Recall triangle area formula

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

Step2: Substitute values into formula

Given base $b = 4$ cm and height $h = 5$ cm. Substitute into the formula: $A = \frac{1}{2} \times 4 \times 5$.

Step3: Calculate the result

First, calculate $4 \times 5 = 20$. Then, $\frac{1}{2} \times 20 = 10$. So the area is $10$ $cm^2$ (note: the options have units as cm, but the correct unit for area should be $cm^2$, but among the options, 10 cm is the numerical value from the calculation).

Answer:

10 cm (Note: The unit in the options is inconsistent with the area unit, but the numerical value from the area calculation of the triangle is 10, so the answer is the option with 10 cm.)