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Sorting Shapes by Their Lines

Mathématiques · Géométrie · de 9 à 10 ans

Nom ______________________ Date ____________

A right triangle has one right angle. How many degrees is that angle?
Réponse : ______________
Which quadrilateral has two pairs of parallel sides?
- A trapezoid
- A kite
- A parallelogram
- An arrowhead
Which of these shapes always has two pairs of parallel sides?
- Rectangle
- Right triangle
- A shape with three unequal sides
A square has both parallel sides and perpendicular sides.
En entourer un : Vrai Faux
A rectangle has 4 right angles. How many right angles do two rectangles have?
Réponse : ______________
A triangle has angles of 90 degrees, 60 degrees, and 30 degrees. Is it a right triangle?
- No, because not all angles are 90 degrees
- Yes, because one angle is 90 degrees
- No, because it has three different angles
Which triangle is a right triangle?
- Sides 3, 4, 5
- Sides 2, 3, 4
- Sides 4, 5, 6
- Sides 2, 4, 6
Ben says a triangle can have two right angles. Is Ben right?
En entourer un : Vrai Faux
Ben says, 'This shape has perpendicular sides, so it must also have parallel sides.' Is Ben always correct?
- Yes, any shape with a right angle also has parallel sides
- No, perpendicular and parallel sides always come together
- No, a right triangle has perpendicular sides but no parallel sides
A square and a rectangle together have how many right angles?
Réponse : ______________

Corrigé

Pour les adultes. Replier cette page avant de passer le reste.

90 · A right angle is 90 degrees.
A parallelogram · A parallelogram has two pairs of parallel sides.
Rectangle · A rectangle's opposite sides are always parallel. Triangles only have three sides, so they can't have two pairs.
Vrai · A square's opposite sides are parallel, and each corner is a right angle, so neighboring sides are perpendicular too.
8 · 2 x 4 = 8 right angles.
Yes, because one angle is 90 degrees · A right triangle only needs one 90-degree angle. The other two angles can be any size, as long as all three add up correctly.
Sides 3, 4, 5 · 3, 4, 5 satisfies 3² + 4² = 5².
Faux · Ben is wrong: two right angles already use 180 degrees.
No, a right triangle has perpendicular sides but no parallel sides · A right triangle's two legs meet at a right angle, so they are perpendicular. But none of its three sides run parallel to each other.
8 · 4 + 4 = 8 right angles.