Proving Triangles Similar

Red and gray bricks were used to build a decorative wall. The number of red bricks_number of gray bricks was 5/2. There were 175 bricks used in all. How many red bricks were used?

125

A model is made of a car. The car is 9 feet long and the model is 6inches long. What is the ratio of the length of the car to the length of the model?

18:1

Michele wanted to measure the height of her school's flagpole. She placed a mirror on the ground 48 feet from the flagpole, the walked backward until she was able to see the top of the pole in the mirror. Her eyes were 5 feet above the ground and she was 12 feet from the mirror. Using similar triangles, find the height of the flagpole to the nearest tenth of a foot.

20ft

A salsa recipe uses green pepper, onion, and tomato in the extended ratio 1:3:9. How many cups of onion are needed to make 117 cups of salsa?

27

You want to draw an enlargement of a design that is printed on a card that is 4in. by 5in. You will be drawing this design on a piece of paper that is 8 1/2in. by 11in. What are the dimensions of the largest complete enlargement you can make?

8 1/2in. by 10 5/8in.

The two rectangles are similar. Which is the correct proportion for corresponding sides? (Small Rectangle) 4m and 12m (Large Rectangle) 8m and 24m

8/4 = 24/12

Are the two triangles similar? How do you know?

Triangles = 180 DEC = 60, 53 GHF = 60, 67 180-60-53 = 67