Starter quiz
- A ______ is a parallelogram where all sides are the same length and the angles are not equal to 90°.
- 'rhombus' ✓
Sofia takes this item from her geometry set. What is the name of this item?- pair of compasses ✓
- protractor
- ruler
- set square
-
Jacob takes this item from his geometry set. What is the name of this item?- pair of compasses
- protractor ✓
- ruler
- set square
-
- Triangle ABC has 2 equal sides and 2 equal angles. What type of triangle is ABC?
- 'isosceles ' ✓
- A ______ is a quadrilateral with two pairs of parallel and equal sides.
- 'parallelogram ' ✓
- Part of a circle's circumference is called...
- an arc ✓
- a chord
- a diameter
- a sector
- a segment
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Exit quiz
- To ______ means to cut or divide an object into two equal parts.
- 'bisect' ✓
- Select the properties of a rhombus.
- Lines of symmetry bisect each other at right-angles ✓
- All the angles are of equal size
- 2 lines of symmetry ✓
- 4 lines of symmetry
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- Two triangles are put together to form a quadrilateral. Which quadrilateral is a rhombus?
Aisha correctly draws three of the four arcs needed to construct the perpendicular bisector of LM. Point A is 5 cm away from point L. Point B is ______ cm away from point M.- '5' ✓
Jacob correctly draws three of the four arcs needed to construct the perpendicular bisector of AB. Which of these statements is correct?- Point C is closer to A than B.
- Point C is closer to B than A.
- Point C is equidistant from A and B. ✓
- It is impossible to tell if C is closer to A or B.
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- Which of these diagrams show an accurate construction of a perpendicular bisector of the line segment AB?
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A rhombus can be constructed from two congruent isosceles triangles
- The diagonals of a rhombus meet at right angles and bisect each other
- It is possible to construct the perpendicular bisector of a line segment without drawing the rhombus
- The line segment could be part of a shape
Common misconception
"My construction didn't accurately bisect the line segment"
Check that your compasses construct a full circle, and do not slip (and create a spiral-shape). Tighten the screw on your compasses, if possible. Then, if only using construction arcs that look confusing, you can construct full circles to help.
Keywords
Bisect - To bisect means to cut or divide an object into two equal parts.
Perpendicular - Two lines are perpendicular if they meet at right angles.
Rhombus - A rhombus is a parallelogram where all sides are the same length.
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