Today our focus was on the six types of triangles. Our learning goal was to identify the types of triangles (acute, obtuse, right, equilateral, isosceles and scalene) by looking at the angles and side attributes. I got the idea for this activity from Interactive Math Journal from Runde's Room.
To begin, I did another formative assessment with the
- Triangles are named by their angles.
- Triangles are named by the number of congruent sides.
- A right triangle has t
wo right angles. - An acute triangle has all acute angles.
- An obtuse triangle has three obtuse angles.
- An equivalent triangle has 3 congruent sides and angles.
- A triangle can have two names.
- An isosceles triangle
is named for its two congruent sides. - A scalene triangle
is named for its angles. - The angles within a triangle measure 180 degrees.
- A triangle is the most stable shape.
Next, I handed each student a sheet of paper with six triangles on them. We numbered the triangles and cut them apart
Once we had taken the notes, we revisited our formative assessment page to discuss how we would answer the statements now:
- Triangles are named by their angles: Sometimes (acute, obtuse, right)
- Triangles are named by the number of congruent sides: Sometimes (equilateral, isosceles, scalene)
- A right triangle has two right angles: Never
- An acute triangle has all acute angles: Always
- An obtuse triangle has three obtuse angles: Never
- An equivalent triangle has 3 congruent sides and angles: Always
- A triangle can have two names: Always (one
for the angles AND onefor the sides) - An isosceles triangle
is named for its two congruent sides. Always - A scalene triangle
is named for its angles: Never (it is named for its sides) - The angles within a triangle measure 180 degrees: Always
- A triangle is the most stable shape: Always
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