What type of angle is 120°?
Angles in degrees and area of rectangles
Year 5 · Upper Key Stage 2 · 5G-1, 5G-2 — Compare, estimate and measure angles; calculate the area of rectangles
Draft — awaiting teacher review
Builds on: Polygons, symmetry and perimeter (Year 4)
I
Concept Anchor
Angles are measured in degrees (°). Acute is less than 90°, obtuse is between 90° and 180°, reflex is more than 180°. The area of a rectangle is length × width, in square units.
Worked example
Area of a rectangle 7 cm by 4 cm.
- 1.It is 4 rows of 7 squares.
- 2.7 × 4 = 28.
- 3.Area = 28 cm².
II
Guided Check
Is an angle of 200° acute, obtuse or reflex?
III
Independent Diagnostic Practice
A rectangle is 7 cm long and 4 cm wide. What is its area?
A rectangle has an area of 36 cm². It is 9 cm long. How wide is it?