Draw a right angle
Lesson 1: Use eke to draw a right angle, given a given vertex and side
- Place the vertex of the ruler’s right angle to coincide with the given vertex, one side of the square of the ruler coincides with the side of the given angle.
- Draw the remaining side of the angle coincident with the remaining right angle side of the ruler.
Lesson 2: Use eke to check how many right angles are there in each of the following figures?
- Place the vertex of the right angle of the keke on the vertex of the angle to be examined.
- If two sides of an angle coincide with two sides of a right angle, then the angle is a right angle
- If either side of the angle does not coincide with the side of the right angle, then the angle is non-square.
- Count the number of right angles and answer the question of the problem.
Figure 1 has 4 right angles
Figure 2 has 2 right angles.
Lesson 3: Which two pieces of cardboard can be put together at a right angle like picture A or picture B?
Imagine, rotate and match the cardboard pieces to get the given square.
Figure A is made up of cardboard 1 and card 4.
Figure B is made up of cardboard 2 and card 3.
Lesson 4: Practice
Fold the piece of paper in the following figure to get a right angle?
Observe the picture and the direction of the arrow to fold the paper correctly according to the requirements of the problem.
Students take any piece of paper and fold it in half and then in four as shown in the picture to get a right angle.
You can use this square instead of eke to check your recognition of right angles.