Area of Triangles.

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Presentation transcript:

Area of Triangles

Formula To find the area for a triangle, the formula is: ½ x B x H Remember that ½ can be entered into the calculator as 0.5 (like ½ of a dollar is 0.50 cents)

Example In this triangle: B= 6 in. H= 8 in. Let’s plug it into our formula: ½ x B x H = 0.5 x 6 x 8 = 24 inches squared 8 in 6 in

Try Another In this triangle: B= 24 H= 7 Let’s plug this into our formula: ½ x B x H = 0.5 x 24 x 7 = 84 cm squared 7 cm 24 cm

Your Turn In this triangle: B= 36 H= 12 Let’s plug this into our formula: ½ x B x H = 0.5 x 36 x 12 = 216 mm squared 12 mm 36 mm

Perimeter and Area Review

Find the Perimeter and Area L x W= 5 x 3 = 15 in squared

Find the Perimeter and Area 8 cm 8 cm 6 cm 14 cm Perimeter= 8+8+14= 30 cm Area= ½ x B x H = 0.5 x 14 x 6= 42 cm squared

Find Perimeter and Area 24 mm Perimeter= 24+24+24+24= 96 mm Area= L x W = 24 x 24 = 576 mm squared

Find the Perimeter and Area L x W = 8 x 4 = 32 in squared

Independent Practice Complete the independent Practice Sheet finding the Perimeter and Area of all the shapes. Remember, this is your work…there is no talking!