How to do sums on areas of triangle and circumference and area of circle pls give examples

Area of triangles is found by area = ½ (base × height) square units

Area of a circle is found by area=π r²

π which is pi equals 3.14 and r is radius then you square it. If you have diameter in your equation divide it by 2.

Circumference is found by 2(3.14)r-radius

Explanation:

Hope this helps

i don't think so because different teachers have different materials. tehy teach differently, unless you know for sure your teacher is the exact same as others. i would just contact ur teacher