Calculating Triangle Areas

In this lesson, Kaeleigh teaches how to calculate the area of triangles. The video begins with a recap of the parallelogram area formula and explains how triangles can be formed within parallelograms. It then derives the formula for the area of a triangle as half the base times height. The lesson includes guidance on identifying the base and height in various triangle orientations and provides example calculations. The video concludes with encouragement to practice through online games and quizzes.

What is the formula to calculate the area of a parallelogram?

• Base + Height

• Base / Height

• Base x Height

• 1/2 x Base x Height

How many triangles can be formed by drawing a diagonal inside a parallelogram?

• 1

• 2

• 4

• 3

What is the area of a triangle inside a parallelogram with an area of 18?

• 18

• 36

• 9

• 4.5

How is the area of a triangle calculated?

• 1/2 x Base x Height

• Base x Height

• Base + Height

• Base / Height

In a triangle, what do we typically call the bottom side?

• Vertex

• Base

• Height

• Diagonal

What is the height in a triangle?

• The perimeter of the triangle

• The base of the triangle

• The distance to the opposite vertex at a right angle

• The longest side

In a non-right triangle, how do we determine the base for calculating the area?

• The side opposite the right angle

• The shortest side must be the base

• The longest side must be the base

• Any side can be the base

What is the area of a triangle with a base of 11 inches and height of 4 inches?

• 44 inches squared

• 22 inches squared

• 8 inches squared

• 15 inches squared

How do we calculate the area of a triangle with base 8.93 and height 1.65?

• 14.72

• 7.36

• 9.36

• 4.68

What is the correct unit for expressing the area of a triangle?

• Units

• Cubic units

• Square units

• Linear units