Check if the following are triangles? If yes name them? 1) ΔTAR, ∠T= 184 and ∠A = 86 2) ΔDEZ, ∠D = 60 and ∠E = 60 3) ΔCHI, ∠C = 30, ∠H = 60 and ∠I = 90 4)ΔJMR, ∠J = 5, ∠M = 120 and ∠R = 67 5) ΔKLM, bar(KL) = bar(LM) = bar(MK)

Name the following triangles?
1) ΔTAR, ∠T= 184 and ∠A = 86
2) ΔDEZ, ∠D = 60 and ∠E = 60
3) ΔCHI, ∠C = 30, ∠H = 60 and ∠I = 90
4)ΔJMR, ∠J = 5, ∠M = 120 and ∠R = 67
5) ΔKLM, bar(KL) = bar(LM) = bar(MK)

1 Answer
Jul 29, 2018

Below

Explanation:

1) Not a triangle
Reason: angle sum of any triangle is 180^@ but angleT is already 184^@

2) Triangle (equilateral)
Reason: equilateral triangles all have their interior angles equal to 60^@

3) Triangle (right-angled)
Reason: angle sum does equal to 180^@ and an angle is equal to 90^@ which is a right angle

4)Not a triangle
Reason: same as 1

5)Triangle (equilateral)
Reason: all sides of an equilateral triangle is the same