Area and Circumference of a Circle Recall and

Key vocabulary Radius Diameter Circumference Arc Sector

Area & Circumference of a Circle The area is the amount of space taken

Area & Circumference of a Circle r = 10 r = 4 Note rounding

Area of a circle – focus of lesson A circle has a radius of

Area of a semi-circle Same as normal but then divide by 2 50. 26548246

Find diameter/radius when given area Then must square root to find r

Problem solving and reasoning An artist is painting a mural. The mural is to

Slides: 20

Download presentation

Area and Circumference of a Circle Recall and use the formula for the area & circumference of a circle If you have any questions regarding these resources or come across any errors, please contact helpful-report@pixl. org. uk

Key vocabulary Radius Diameter Circumference Arc Sector

Area & Circumference of a Circle The area is the amount of space taken up by the circle – here it is the amount of blue space. Circumference Radius Diameter x Area The circumference is the distance around the circle.

Area & Circumference of a Circle r = 10 r = 4 Note rounding here!

Area of a circle – focus of lesson A circle has a radius of 8 cm. Find the area of the circle to 1 decimal place. A circle has a diameter of 18 cm. Find the area of the circle to 1 decimal place.

Area of a semi-circle Same as normal but then divide by 2 50. 26548246 ÷ 2 A = 25. 13274123 cm 2 Now round (not before!) A = 25. 1 cm 2

Find diameter/radius when given area Then must square root to find r

Find diameter/radius when given area

Problem solving and reasoning

Problem solving and reasoning An artist is painting a mural. The mural is to be painted on a circular canvas. The painter wants the mural to be as large as possible. Paint costs £ 17 per square metre and she has a total of £ 500 to spend on paint. Find the diameter of the mural to 1 decimal place.

Exam specimen questions