Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.

The isosceles triangle has perimeter = 18 base = 8 cm so the equal sides = (18 - 8) /2 = 5

altitude and area are shown in the diagram... total area = 76

area of the isosceles triangle can be also found using the formula of Heron: Δ = √[s (s-a) (s-b)(s-c) here a = 8, b = 5 c = 5 so s = (8+5+5)/2 = 9

Δ = area = √[ 9*1*4*4] = 12 sq cm

Add this to the area of square = 8 * 8 = 64 cm² total 76 cm²

use the formula for area of isosceles triangle ABC: one way is to find altitude using the Pythagoras theorem. so draw a perpendicular from B on to AC..

otherwise use the formula for area of triangle with 3 sides given...

Area of the square= 8x8 = 64sq.cm area of triangle= (1/2) base x height base=8cm. Since the triangle is isosceles, the other 2 sides would be equal measuring 5cm each. Height could be found using Pythogoras theorem[5^2- 4^2=3^2], we get height=3cm. Area of triangle=(1/2)(3)(8)=12sq.cm 64+12=76 sq.cm

draw an imaginary perpendicular opposite to the side measuring 8cms. This would cut the triangle into half forming 2 right angled triangles. Apply Pythogoras theorem to one half and you will get the height of perpendicular which is height of the triangle. I hope this helps.