An acute angle measures what?
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Answer
Less than 90°
Acute angles are smaller than a right angle. Obtuse angles are bigger than 90°.
Shapes and Measures
Angles, area, volume, units, negative numbers and ratio
Shapes and Measures is a Bertopia flashcard pack of 66 cards: angles, area, volume, units, negative numbers and ratio. It covers angles; area and perimeter; circles; volume and 3D shapes; units and conversions; negative numbers; ratio and scale.
Sample cards
What does perimeter measure?
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Answer
The distance around a shape
Perimeter is the distance around the edge. Area is the number of square units that cover the inside.
A circle has a radius of 5 cm. What is its diameter?
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Answer
10 cm
The diameter goes right across through the centre, so it is twice the radius.
What does volume measure?
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Answer
How much space a 3D shape fills
Volume is the number of unit cubes that fill a solid without gaps.
How many metres are in a kilometre?
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Answer
1,000
Kilo means 1,000, so 1 km = 1,000 m.
How many degrees colder than freezing is −6 °C?
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Answer
6 degrees
0 °C is where water freezes, so −6 °C is 6 degrees below it.
Sources
23 sources
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- Illustrative Mathematics, Grade 6 Unit 7 Lesson 3: Comparing Positive and Negative Numbers, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 6 Unit 1 Lesson 18: Surface Area of a Cube, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics 6-8, Grade 6 glossary, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 6 Unit 7 Lesson 1: Positive and Negative Numbers, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 6 Unit 1 Lesson 4: Parallelograms, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 6 Unit 2 Lesson 1: Introducing Ratios and Ratio Language, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 6 Unit 1 Lesson 9: Formula for the Area of a Triangle, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 7 Unit 5 Lesson 3: Changing Temperatures, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 7 Unit 7 Lesson 2: Adjacent Angles, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 7 Unit 7 Lesson 1: Relationships of Angles, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 7 Unit 3 Lesson 9: The Area of a Circle, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics 6-8, Grade 7 glossary, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 7 Unit 5 Lesson 5: Subtracting Rational Numbers, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 7 Unit 7 Lesson 3: Nonadjacent Angles, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 8 Unit 5 Lesson 14: The Volume of a Cylinder, Illustrative Mathematics (CC BY 4.0)
- Illustrative Mathematics, Grade 8 Unit 1 Lesson 16: Parallel Lines and the Angles in a Triangle, Illustrative Mathematics (CC BY 4.0)
- Approximate conversions from US customary measures to metric, US National Institute of Standards and Technology (US government work)
- Metric (SI) prefixes, US National Institute of Standards and Technology (US government work)
- National curriculum in England: mathematics programmes of study, Department for Education (UK), Open Government Licence v3.0
- Prealgebra 2e, 9.4 Use Properties of Rectangles, Triangles, and Trapezoids, OpenStax, Rice University (CC BY 4.0)
- How hot are Yellowstone's boiling waters? Some are hotter than others, US Geological Survey (US government work)
- SI Units: Temperature, US National Institute of Standards and Technology (US government work)
