Question

11cm
11cm
9cm
11cm
area :
perimeter :

Explanation:

Step1: Calculate the Area

The formula for the area of a triangle is $A = \frac{1}{2} \times base \times height$. Here, the base is $11$ cm and the height is $9$ cm. So, $A = \frac{1}{2} \times 11 \times 9 = \frac{99}{2} = 49.5$ $cm^2$.

Step2: Calculate the Perimeter

The perimeter of a triangle is the sum of its three sides. All three sides are $11$ cm, so the perimeter $P = 11 + 11 + 11 = 33$ cm.

Answer:

Area: $49.5$ $cm^2$
Perimeter: $33$ cm