The Triangle Proportionality (side-splitting) Theorem
Grade 10 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.
Milo fixes a crossbar GH across a tent front. In △CDF, GH ∥ DF, with G on CD and H on CF. How long is CH, in feet?
Noah builds a ramp with a brace GH. In △CDF, GH ∥ DF, with G on CD and H on CF. How long is CH, in feet?
Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 3, GD = 5, CF = 16. Lengths in feet. Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 3, GD = 5, CF = 16. Lengths in feet. C D F G H 3 5 CF = 16 Lengths in feet Not to scale Pia sews a seam GH across a sail. In △CDF, GH ∥ DF, with G on CD and H on CF. How long is CH, in inches?
Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 6, GD = 4, CF = 25. Lengths in inches. Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 6, GD = 4, CF = 25. Lengths in inches. C D F G H 6 4 CF = 25 Lengths in inches Not to scale Ren plans a path GH across a triangle park. In △CDF, GH ∥ DF, with G on CD and H on CF. How long is CH, in meters?
Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 5, GD = 7, CF = 18. Lengths in meters. Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 5, GD = 7, CF = 18. Lengths in meters. C D F G H 5 7 CF = 18 Lengths in meters Not to scale Tala walks a path CG that cuts the corner angle of a triangle park in half. In △CDF, CG bisects ∠C and meets DF at G. How long is DG, in meters?
Sketch, not to scale: △CDF; CG cuts ∠C into two equal angles; G on DF. CD = 8, CF = 12, DF = 15. Lengths in meters. Sketch, not to scale: △CDF; CG cuts ∠C into two equal angles; G on DF. CD = 8, CF = 12, DF = 15. Lengths in meters. C D F G 8 12 DF = 15 Lengths in meters Not to scale Bo draws a road CG that halves the angle at town C. In △CDF, CG bisects ∠C and meets DF at G. How long is DG, in feet?
Sketch, not to scale: △CDF; CG cuts ∠C into two equal angles; G on DF. CD = 10, CF = 15, DF = 20. Lengths in feet. Sketch, not to scale: △CDF; CG cuts ∠C into two equal angles; G on DF. CD = 10, CF = 15, DF = 20. Lengths in feet. C D F G 10 15 DF = 20 Lengths in feet Not to scale Esme builds a ramp with a brace GH. In △CDF, GH ∥ DF, with G on CD and H on CF. What is x?
Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 4, GD = 6, CH = x + 2, HF = 2x − 1. Lengths in cm. Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 4, GD = 6, CH = x + 2, HF = 2x − 1. Lengths in cm. C D F G H 4 6 x + 2 2x − 1 Lengths in cm Not to scale Jun fixes a crossbar GH across a tent front. In △CDF, GH ∥ DF, with G on CD and H on CF. What is x?
Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 3, GD = 6, CH = x + 1, HF = 3x − 5. Lengths in cm. Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 3, GD = 6, CH = x + 1, HF = 3x − 5. Lengths in cm. C D F G H 3 6 x + 1 3x − 5 Lengths in cm Not to scale Kira glues a strip GH across a triangle window. In △CDF, GH ∥ DF, with G on CD and H on CF. What is x?
Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 5, GD = 10, CH = x + 3, HF = 3x − 5. Lengths in cm. Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 5, GD = 10, CH = x + 3, HF = 3x − 5. Lengths in cm. C D F G H 5 10 x + 3 3x − 5 Lengths in cm Not to scale Luz cuts a wedge of cheese along GH. In △CDF, GH ∥ DF, with G on CD and H on CF. What is x?
Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 6, GD = 9, CH = x + 4, HF = 2x − 1. Lengths in cm. Sketch, not to scale: △CDF; G on CD, H on CF; GH ∥ DF (arrows). CG = 6, GD = 9, CH = x + 4, HF = 2x − 1. Lengths in cm. C D F G H 6 9 x + 4 2x − 1 Lengths in cm Not to scale