Area of Parallelograms, Triangles, and circles

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Presentation transcript:

Area of Parallelograms, Triangles, and circles Objective: Students will be able to use formulas to find the area of parallelograms, triangles, and circles.

Information Circle Formula: πr2

Find area of Parallelogram 10 yd. 6 in. 15 in. 9 yd.

Find area of Parallelogram 14 cm. 20 in. 11 cm. 5 in. 7 in. 4 ft. 5 ft. 9 in.

Area of Triangles 10m 5in 15m 12in

Area of Triangle 3ft 8m 10ft 5m 20cm 7ft 6ft 2cm

Information Radius: distance from center to point on circle. Circle: all points same distance from center. Center: fixed point middle of circle Chord: line connects two points on a circle; NOT through the center. Diameter: distance across circle passing through center Central Angle: angle created by going through the center pt. Radius: distance from center to point on circle. ½ diameter Circumference: distance around circle Formula of circumference: C = πd

Identify the circle parts

Find the area of a circle A=πr2 24ft.

Find the area of a circle 56cm.

Word Problem I have a circular garden that has a diameter of 20ft. In the middle, I want to put a cement patio down for a sitting area. I want the slab to measure 10ft x 12ft. Determine the area of the entire garden? 2. Determine the area of the cement patio. 3. I want to plant flowers in the area not taken up by the patio. How much space to I have to plant the flowers?

Word Problem I’m painting a room in my house. The room is made up of 4 walls all rectangular in shape. The walls are 12ft long and 9ft high. One wall has a window that is 4ft by 4ft. Another wall has a door 3ft by 7ft. I’m going to buy a gallon of paint that covers 50ft2. How many gallons do I need to buy if I want to do 2 coats of paint and what would the cost be if each gallon was $13 including tax?

Wrap-up Question/Comments Hw: worksheet