# 10.3: Area and Perimeter of Triangles

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**Practice**Area and Perimeter of Triangles

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Area

Area is the space within the perimeter of a two-dimensional figure.Perimeter

Perimeter is the distance around a two-dimensional figure.Perpendicular

Perpendicular lines are lines that intersect at a angle. The product of the slopes of two perpendicular lines is -1.Right Angle

A right angle is an angle equal to 90 degrees.Right Triangle

A right triangle is a triangle with one 90 degree angle.Area of a Parallelogram

The area of a parallelogram is equal to the base multiplied by the height: A = bh. The height of a parallelogram is always perpendicular to the base (the sides are not the height).Area of a Triangle

The area of a triangle is half the area of a parallelogram. Hence the formula: .### Image Attributions

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This concept teaches students to find the area and perimeter of triangles.

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At Grade
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Date Created:

Jul 17, 2012
Last Modified:

Oct 06, 2016
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