Name :
Sheet 1
Triangle - Angles
1) In the figure, DABD is an isosceles triangle with AB = AD. Find mÐACB.
A
440
D
B
2) In the figure, KLMN is a square. Determine mÐMKJ.
290
C
L
K
M
N
490
J
3) Triangle OPQ and triangle ORS are acute triangles. What is mÐP?
Q
R
670
630
O
640
S
P
4) If DEGH is an isosceles triangle with EG = EH, determine mÐFGH and mÐEHG.
G
F
600
H
300
460
E
5) DRSU is an equilateral triangle. What is mÐQTP and mÐTOU?
R
Q
550
O
S
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Name :
Answer key
Sheet 1
Triangle - Angles
1) In the figure, DABD is an isosceles triangle with AB = AD. Find mÐACB.
A
440
D
B
390
2) In the figure, KLMN is a square. Determine mÐMKJ.
290
C
L
K
M
N
490
860
J
3) Triangle OPQ and triangle ORS are acute triangles. What is mÐP?
Q
R
670
630
O
640
600
S
P
4) If DEGH is an isosceles triangle with EG = EH, determine mÐFGH and mÐEHG.
G
F
600
H
300
460
1570 ; 670
E
5) DRSU is an equilateral triangle. What is mÐQTP and mÐTOU?
R
Q
550
O
S
350 ; 850
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U
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Name :
Sheet 2
Triangle - Angles
1) If DCED is an equilateral triangle, determine mÐAED.
C
E
B
1200
190
A
D
2) DJKM is an isosceles triangle. Find mÐLMK, if mÐLMJ = 900.
L
K
860
J
M
B
3) If DABC is a right triangle, determine mÐB.
250
320
C
D
A
4) DEFG is an equilateral triangle. If EH = HF, find mÐHEF and mÐGFH.
G
H
1040
E
5) If DVYZ and DXYW are right triangles, then find mÐVYZ and mÐZYX.
F
Y
440
W
440
Z
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V
X
Name :
Answer key
Sheet 2
Triangle - Angles
1) If DCED is an equilateral triangle, determine mÐAED.
C
E
B
1200
190
A
D
790
2) DJKM is an isosceles triangle. Find mÐLMK, if mÐLMJ = 900.
L
K
860
J
M
430
B
3) If DABC is a right triangle, determine mÐB.
250
320
C
D
A
330
4) DEFG is an equilateral triangle. If EH = HF, find mÐHEF and mÐGFH.
G
H
1040
E
380 ; 220
5) If DVYZ and DXYW are right triangles, then find mÐVYZ and mÐZYX.
F
Y
440
W
440
Z
460 ; 920
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V
X
Name :
Sheet 3
Triangle - Angles
1) In the figure, DDEF and DHGF are right triangles. Find mÐDFH.
F
G
E
230
290
H
D
2) DXYZ and DXWZ are isosceles triangles. Determine mÐYZW, if mÐWXY = 900.
Y
Z
X
W
3) DKLM is an equilateral triangle. Find mÐKOL.
L
P
O
M
N
K
4) DOPQ and DORS are isosceles triangles with OP = PQ and OR = OS. Find mÐOPQ and mÐROQ.
R
660
O
S
Q
P
5) In the figure, triangle TVS is a right triangle. Determine mÐUTS and mÐVST.
T
240
400
U
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V
S
Name :
Answer key
Sheet 3
Triangle - Angles
1) In the figure, DDEF and DHGF are right triangles. Find mÐDFH.
F
G
E
230
290
H
520
D
2) DXYZ and DXWZ are isosceles triangles. Determine mÐYZW, if mÐWXY = 900.
Y
Z
X
W
1350
3) DKLM is an equilateral triangle. Find mÐKOL.
L
P
O
M
N
K
1200
4) DOPQ and DORS are isosceles triangles with OP = PQ and OR = OS. Find mÐOPQ and mÐROQ.
R
660
O
S
Q
P
840 ; 1320
5) In the figure, triangle TVS is a right triangle. Determine mÐUTS and mÐVST.
T
240
400
740 ; 660
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U
V
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