Angles Rules + area + perimeter

Question 1

Angle facts (straight lines)

Answer 1

• Vertically opposite angles are equal.
• Angles at a point add up to 360°.
• Angles on a straight line add up to 180°

Question 2

Angle facts (parallel lines)

Answer 2

• CORRESPONDING ANGLES on parallel lines are equal.
• ALTERNATE ANGLES on parallel lines are equal.
• CO-INTERIOR ANGLES
  add up to 180degrees

Question 3

Isosceles triangles

Answer 3

Base angles of isosceles triangles are equal

Question 4

Sum of Angles in polygons

Answer 4

To find the sum of interior angles of a polygon, multiply the number of triangles in the polygon by 180°.

The formula for calculating the sum of interior angles is ( n − 2 ) × 180 ∘ where is the number of sides.

All the interior angles in a regular polygon are equal.

1 interior angle + 1 external angle = 180 degrees

Question 5

Perimeter

Answer 5

Perimeter is the measurement of the distance around something;

Question 6

Area (rectangle)

Answer 6

For rectangles and squares, A = length x width

Question 7

Area (triangle)

Answer 7

Area triangle = 1/2 × base × height.

Question 8

Area (parallelogram)

Answer 8

Area=Base * Height

Question 9

Area (circle)

Answer 9

A=π*radius2

Question 10

Area (trapezoid/ trapezium)

Answer 10

A=(a+b) * h /2