Students will find the area of triangles (10-2). Objective: Students will find the area of triangles (10-2).

Vocabulary Triangle height – the distance from a base to the opposite vertex. Triangle base – any one of its sides. Area of a triangle – A = ½ bh

Steps: Read directions and write problem. Use the following formula A=1/2bh. Plug in your #’s. Multiply. Divide by 2. Write final answer.

Examples Find the area of each triangle. 6 10

Examples Find the area of each triangle. 6 10 A = ½ bh

Examples Find the area of each triangle. A = ½ bh 6 10 A = ½ bh A = ½ x 10 x 6 replace b with 10 and h with 6

Examples Find the area of each triangle. A = ½ bh 6 10 A = ½ bh A = ½ x 10 x 6 replace b with 10 and h with 6 A = 5 x 6

Examples Find the area of each triangle. A = ½ bh 6 10 A = ½ bh A = ½ x 10 x 6 replace b with 10 and h with 6 A = 5 x 6 A = 30 The area is 30 units²

Examples Find the area of each triangle. 17cm 28cm

Examples Find the area of each triangle. 17cm 28cm A = ½ bh

Examples Find the area of each triangle. A = ½ bh A = ½ x 28 x 17 17cm

Examples Find the area of each triangle. A = ½ bh A = ½ x 28 x 17 17cm 28cm A = ½ bh A = ½ x 28 x 17 A = 14 x 17

Examples Find the area of each triangle. A = ½ bh A = ½ x 28 x 17 17cm 28cm A = ½ bh A = ½ x 28 x 17 A = 14 x 17 A = 238 The area is 238 cm².

Examples Find the area of the Bermuda Triangle. Let the base be the distance from Melbourne to Bermuda (1,150 mi). Then the height will be 756 mi.

Find the area of the Bermuda Triangle Find the area of the Bermuda Triangle. Let the base be the distance from Melbourne to Bermuda (1,150 mi). Then the height will be 750 mi. A = ½ bh

Find the area of the Bermuda Triangle Find the area of the Bermuda Triangle. Let the base be the distance from Melbourne to Bermuda (1,150 mi). Then the height will be 750 mi. A = ½ bh A = ½ x 1,150 x 756

Find the area of the Bermuda Triangle Find the area of the Bermuda Triangle. Let the base be the distance from Melbourne to Bermuda (1,150 mi). Then the height will be 750 mi. A = ½ bh A = ½ x 1,150 x 756 A = 575 x 756

Find the area of the Bermuda Triangle Find the area of the Bermuda Triangle. Let the base be the distance from Melbourne to Bermuda (1,150 mi). Then the height will be 750 mi. A = ½ bh A = ½ x 1,150 x 756 A = 575 x 756 A = 434,700 The area of the Bermuda Triangle is 434,700 mi².

Guided Practice Find the area of each triangle. 9 6 7mm 10mm 8ft 12ft

Guided Practice Find the area of each triangle. A = ½ bh A = ½ x 10x7 9 6 7mm 10mm 8ft A = ½ bh A = ½ x 10x7 A = 5x7 A= 35 mm² A = ½ bh A = ½ x 6x9 A = 3x9 A = 27 units² 12ft A = ½ bh A= ½ x 12x8 A = 6x8 A = 48 ft²

Guided Practice What is the area of a triangle with a height of 40m and a base of 56.8m?

Guided Practice What is the area of a triangle with a height of 40m and a base of 56.8m? A = ½ bh A = ½ x 56.8 x 40 A = 28.4 x 40 A = 1,136m²