Area and Perimeter of Compound Shapes
Bruno the bear’s garden is an L-shape. Split it into two rectangles, find any missing side lengths (8 − 3 = 5 m), work out each area (18 m² and 10 m²) and add them to get 28 m². Then find the area of a bigger L-shape yourself, and learn how to find the perimeter.
Watch next
2:05Angles: Types, Straight Lines and Around a Point
Leo the lion shows acute, right, obtuse and reflex angles, then uses the fact that angles on a straight line add up to 180° to find a missing angle. Try angles around a point (360°) yourself and learn to estimate first.
1:47Angles in Triangles and Quadrilaterals
The angles in a triangle add up to 180°, and the angles in a quadrilateral add up to 360°. Momo the monkey finds the missing angle in a triangle with angles of 65° and 70° (45°), then you find the missing angle in a quadrilateral. Plus a top tip for isosceles triangles.
1:50Properties of 2D Shapes: The Quadrilateral Family
Professor Hoot the owl introduces the quadrilateral family: square, rectangle, rhombus, parallelogram, trapezium and kite. Solve a riddle using equal sides, right angles and parallel lines ("four equal sides, no right angles" is a rhombus), then solve one yourself, and learn why a square is a special rectangle.