Objective: To classify triangles as acute, right, obtuse, equilateral, isosceles, and scalene....
GA QCC: #10 (partial objective)
Lesson: Triangle Classification
NAME: _____________________________
1. Triangles are classified by angles and by sides.
Classification by ANGLES:
2. An acute triangle has 3 acute angles. If these angles are all congruent (equal), then the triangle is also equiangular.
3. A right triangle has exactly one right angle.
4. An obtuse triangle has exactly one obtuse (between 90 and 180 degrees).
5. Click HERE (Figure 1) to answer questions. Measure all the angles of each triangle and answer the following questions:
5a. Type of triangle:______________ 5b. Type of triangle: _________________
m<A: __________________________ m<D: _____________________________
m<B: __________________________ m<E: _____________________________
m<C: __________________________ m<F: _____________________________
5c. Type of triangle:______________ 5d. Type of triangle: _________________
m<G: __________________________ m<J: ______________________________
m<H: __________________________ m<K: _____________________________
m<I: ___________________________m<L: _____________________________
5e. Type of triangle:_______________5f. Type of Triangle: ________________
m<M: __________________________ m<P: _____________________________
m<N: __________________________ m<Q: _____________________________
m<O: __________________________ m<R: _____________________________
6. How many acute angles can a triangle have? _____________________
7. How many right angles? ______________________
8. How many obtuse angles? _____________________
Classification by SIDES:
9. An equilateral triangle has 3 congruent sides.
10. An isosceles triangle has at least 2 congruent sides.
11. A scalene triangle has no congruent sides.
12. Click HERE (FIGURE 2) to answer questions. Measure all the sides of each triangle and answer the following questions:
12a. Type of triangle:________________ 12b. Type of triangle:_______________
Side a:_____________________________ Side d:__________________________
Side b:_____________________________ Side e:__________________________
Side c:_____________________________ Side f:__________________________
12c. Type of triangle:_________________ 12d. Type of triangle:_____________
Side g:______________________________ Side j:_________________________
Side h:______________________________ Side k:_________________________
Side i: ______________________________ Side l:_________________________
12e. Type of triangle:__________________ 12f. Type of triangle:____________
Side m:______________________________ Side p:________________________
Side n:_______________________________ Side q:________________________
Side o:_______________________________ Side r:________________________