Year 6
Find unknown angles in triangles
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Lesson details
Key learning points
- In this lesson, we will represent the angles in a triangle pictorially and algebraically before learning how to calculate missing angles.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
What shape is being described below?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1707169842%2Fvqkomwyxihg9rkgo6zmn.png&w=1080&q=75)
Square
Trapezium
Q2.
Select the correct description of a trapezium.
A quadrilateral with four equal sides and four right angles.
A quadrilateral with two pairs of equal sides and two pairs of equal angles
Q3.
The interior angles in a quadrilateral add up to:
180°
90°
Q4.
What is the value of the missing angle?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1707169847%2Fx9ncrz7op6aznws2iqrv.png&w=1080&q=75)
145°
45°
Q5.
If a parallelogram has a perimeter of 6cm, what are the lengths of the sides?
1cm, 1cm, 1cm, 3cm
2cm, 3cm, 1cm, 0cm
3 Questions
Q1.
What is the value of angle a?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1707168166%2Fct0e9pkvozeirhxbxvgy.png&w=640&q=75)
124°
236°
Q2.
What is the value of angle a?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1707168172%2Fclaaaddna4kdssfzzkx6.png&w=384&q=75)
160°
200°
Q3.
What is the value of angle y?
![An image in a quiz](/_next/image?url=https%3A%2F%2Foaknationalacademy-res.cloudinary.com%2Fimage%2Fupload%2Fv1707168175%2Fqciw0l3y4wzora8q66qa.png&w=1080&q=75)
145°
85°