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Numeracy - PowerPoint PPT Presentation

Numeracy. L.O. I can calculate the angles in a triangle. Obtuse angle More than 90°. Right angle 90°. Acute angle Less than 90°. Types of Angle. Straight angle 180°. Reflex angle More than 180°. Angles in a triangle. The angles in EVERY triangle add up to 180°. What’s my angle?.

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Presentation Transcript

Numeracy

L.O. I can calculate the angles in a triangle.

More than 90°

Right angle

90°

Acute angle

Less than 90°

Straight angle

180°

Reflex angle

More than 180°

Angles in a triangle

The angles in EVERY triangle add up to 180°

What’s my angle?

What’s this angle?

60º

90º

90° + 60° = 150°

180° - 150° = 30°

What’s my angle?

What’s this angle?

55º

90° + 55° = 145°

180° - 145° = 35°

What’s my angle?

What’s this angle?

78º

30º

78° + 30° = 108°

180° - 108° = 72°

What’s my angle?

What’s this angle?

60º

60º

60° + 60° = 120°

180° - 120° = 60°

What’s my angle?

What’s this angle?

80º

130º

?

50º

180° - 130° = 50°

50° + 80° = 130°

180° - 130° = 50°

What’s my angle?

80º

115º

65º

?

50° + 80° = 130°

180° - 130° = 50°

180° - 115° = 65°

• Orange Group:

• Mrs Broughton will be working with you.

• Working in pairs, draw triangles for each other. For each triangle:

• a) Estimate the sizes of all three angles.

• b) Measure two angles and check them together.

• c) Calculate the third angle in the triangle using the 180° rule.

• Yellow/Green Group:

• Mrs Lowe will be working with you.

• Complete page 54 of the Abacus book.

• When you have finished, work in pairs to create your own triangle problems for each other and solve them.

• Red/Blue Group:

• Miss Rostron will be working with you.

• Complete page 55 of the Abacus book.

• When you have finished, work in pairs to create your own triangle problems for each other and solve them.

L.O. I can calculate the angles in a triangle.