Grades 6-8 Fcat 2.0 Mathematics Reference Sheet Page 15
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20Objective: Estimate and determine the area of a triangle with whole number dimensions.
The area (A) of a triangle is one half the product of the base (b) and the height (h).
The formula for finding the area of a triangle is: A = ½ bh and is measured in square units.
Examples:
5 cm
5 cm
4 cm
4 cm
A = ½ bh
A = ½ x 4 x 5
A = ½ x 20
A = ½ bh
A = ½ x 4 x 5
A = ½ x 20
A = 10 cm
A = 10 cm
2
2
1.) Determine the area of the triangle.
2.) Determine the area of the triangle.
A = _______ cm
A = ____________
2
7 cm
8 cm
5 cm
9 cm
3.) Determine the area of an obtuse triangle with a height
4.) Determine the area of an isosceles triangle with a base of
of 11 cm and a base of 22 cm.
13 cm and a height of 26 cm.
A = ____________
A = ____________
5.) World famous pastry chef, Zoe, is designing a birthday
6.) Jennifer’s dorm room is shaped like a triangle. The
cake for his son, who is a Geometry teacher. He has 4
college brochure says it has an area of 875 square feet. The
layers, all triangles. He wants to put the largest layer (in
room is 35 feet long. Determine the width of the room at its
area) on the bottom and the smallest layer on the top.
widest point.
Determine the area of each layer and order them from
largest to smallest (4 = largest, 1 = smallest)
___ Milk Chocolate layer
b = 12” h = 6”
A =
___ Yellow cake layer
b = 7”
h = 11” A =
___ Dark Chocolate layer b = 4”
h = 17” A =
___ White cake layer
b = 9”
h = 9”
A =
15
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