2D Shapes
What is a triangle?
A 2D shape with three sides and three angles
What is a right angle?
The name for a 90o angle.
It has 4 equal sides and 4 right angles.
Square
The name of a triangle with 3 acute angles.
Acute triangle
Formula of rectangle's area
A = length x width
What is a quadrilateral?
A 2D shape with four sides and four angles
What is an obtuse angle?
The name of an angle that is greater than 90o.
The properties of a rectangle.
It has 4 right angles and 2 pairs of equal-length lines
What is a right triangle?
The name of a triangle with 1 right angle.
Formula of triangle's area
(length x height) : 2
or
1/2 x length x height
Three Kind of Triangle based on its side
Equilateral Triangle
Isosceles Triangle
Scalene Triangle
What is an acute angle?
The name of an angle that is less than 90o.
It has 1 pairs of equal sides and 1 set of parallel sides.
What is an equilateral triangle?
The name for a triangle with all equal sides.
The formula of trapezium's area
1/2 x (L1 + L2) x h
or
(L1 + L2 ) x h : 2
Three Kind of Triangle based on its angle
Acute Triangle
Right Triangle
Obtuse Triangle
The sum of all angle in triangle.
180o.
The difference between a square and rectangle.
square has all equal sides and rectangles have 2 pairs of equal sides
What is a isosceles triangle?
The name for a triangle with 2 equal-length sides and 2 equal angles.
The name for a 3-sided quadrilateral.
Trick question!
There is no 3-sided quadrilateral!
6 kind of quadrilateral
Rectangle, Square, Parallelogram, Trapezium/Trapezoid, Rhombus, and Kite
The sum of all angle in quadrilateral.
360o
What is a rhombus?
The quadrilateral which has 4 equal-length sides, and 2 pairs of equal angles.
The properties of a scalene right triangle.
It has 3 different angles and length sides
The formula of kite's area
1/2 x (d1 x d2)
or
(d1 x d2) : 2