Coordinates in All Four Quadrants
Where is the lily pad? Hopper the frog reads coordinates by going along the x-axis first, then up or down the y-axis: (−3, 2). Learn how negative coordinates work in all four quadrants, then work out where Hopper lands after hopping 4 right and 5 down from (−1, 2).
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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.