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Name : Sheet 1 Triangle - Interior Angles A) Solve for x in each triangle and find the measure of the indicated interior angle. 1) 2) 3) F C (9x + 19)0 B (–2x)0 (–5 – 8x)0 K 350 (–19 + 3x)0 390 (x + 28)0 (6x)0 D A L 560 J E x= x= x= mÐC = mÐF = mÐJ = 4) 5) 6) U R X x)0 870 (7x + 4)0 T V (10 –2 (3x + 1)0 (8x – 4)0 )0 540 P + (–3 (–9x – 5)0 Q 2x 600 W S x= x= x= mÐQ = mÐS = mÐV = B) Solve for x in each triangle and find the measure of the indicated interior angles. V (3x)0 (–5 7 Z (3 (–4x – 2)0 x– 35 )0 X (–5x – 9)0 (x – 3)0 (–1 – 7x)0 (–49 + 6x)0 (2x)0 B Y C T x= x= x= mÐB = mÐX = mÐT = mÐC = mÐY = mÐU = mÐD = mÐZ = mÐV = Printable Worksheets @ www.mathworksheets4kids.com x)0 9) D +4 8) 7) U Name : Answer key Sheet 1 Triangle - Interior Angles A) Solve for x in each triangle and find the measure of the indicated interior angle. 1) 2) 3) F C (9x + 19)0 B (–2x)0 (–5 – 8x)0 K 350 (–19 + 3x)0 390 (x + 28)0 (6x)0 D A L 560 J E x= –15 x= mÐC = 1150 mÐF = 4) 5) 7 820 mÐJ = 610 X 870 x)0 33 6) U R x= (7x + 4)0 T V (10 –2 (3x + 1)0 (8x – 4)0 )0 540 P + (–3 (–9x – 5)0 Q 2x 600 W S x= –11 x= 19 x= mÐQ = 940 mÐS = 350 mÐV = 8 600 B) Solve for x in each triangle and find the measure of the indicated interior angles. V (3x)0 (–5 7 Z (3 (–4x – 2)0 x– 35 )0 X (–5x – 9)0 (x – 3)0 (–1 – 7x)0 (–49 + 6x)0 (2x)0 B x)0 9) D +4 8) 7) Y C T x= 24 x= –12 x= 30 mÐB = 950 mÐX = 510 mÐT = 270 mÐC = 480 mÐY = 830 mÐU = 630 mÐD = 370 mÐZ = 460 mÐV = 900 Printable Worksheets @ www.mathworksheets4kids.com U