Well, darling, to find the area of a rectangle, you simply multiply the length by the width. So, in this case, the area would be 8.5 cm x 6 cm, which equals 51 square centimeters. Easy peasy lemon squeezy!
30cm
The area of triangle is : 24.0
The area of rectangle is : 18.0
Area = 15.58846 cm2
The area of rectangle is : 72.0