Lesson Worksheet: Applications on the Pythagorean Theorem Mathematics • 8th Grade
In this worksheet, we will practice applying the Pythagorean theorem in geometric questions and real-life situations.
Q5:
Determine, to the nearest tenth of an inch, the length of the diagonal of a door of length 88 inches and width 34 inches.
Q7:
Emma and Scarlett are communicating by walkie-talkie with a range of 42 feet. Reaching a 22 ft long bridge, Emma waits while Scarlett crosses and then walks up the bank until she can no longer hear Emma. How far up the river did she walk? Give your answer to one decimal place.
Q8:
A tree, which was growing perpendicular to the ground, was 3 m tall. It snapped at a point that was 1 m above the ground. The top part of the tree fell and hit the ground. However, at the point of the break, the tree remained connected. Find the distance between the base of the tree and the point where the top of the tree touches the ground.
- A1 m
- B m
- C m
- D m
- E m
Q10:
A space station is orbiting Earth at an altitude of 498 miles above the surface. Assuming the radius of the Earth is 4,000 miles, determine, to the nearest mile, the distance between the space station and the farthest point on the Earth’s surface from which it could be seen.
Q11:
Ancient Egyptians created right triangles using ropes with 13 equally spaced knots. The first and last knots (knots 1 and 13) were fixed together on the floor to form one vertex of the triangle. At which other two knots could the rope be fixed to form a right angle at knot 1?
- Aat knots 6 and 7
- Bat knots 5 and 8
- Cat knots 2 and 11
- Dat knots 4 and 9
- Eat knots 3 and 10
Q12:
A zip line was installed at an outside playground. It is 15.5 m long and attached to two posts 15 m apart on a flat ground. Given that at the arrival post, the zip line must be 1.5 meters above the ground, at what height should it be attached to the other post? Give your answer correct to one decimal place.
Q13:
Olivia is a set designer. She wants to use two wooden pieces, a square and a right triangle , which are attached together along by hinges. She wants to place them on the floor, as shown in the figure, and make sure that the two pieces form a right angle. If this is the case, then any line in the triangle is perpendicular to , and any line in the square is perpendicular to . She has no tool with her except a measuring tape.
She measured the length of and found it to be exactly 42 cm. Is the angle between the square and the triangle a right angle?
- AYes
- BNo
Given that is perpendicular to the floor, Olivia could have measured the length of to determine whether the two wooden pieces formed a right angle. What would the length of have been if it were a right angle? Round your answer to the nearest tenth.
Q15:
Triangle has a right angle at . Given that and , find and , rounding your answers to the nearest hundredth.
- A,
- B,
- C,
- D,
Q17:
My empty garage is a rectangular prism that is 2 m high, and the dimensions of the floor are 3 m by 4 m. I have a ladder that is 5.2 m long. Will the ladder fit completely inside my garage?
- Ano
- Byes
Q18:
Determine the area of the rectangle whose diagonal length is 55.1 cm, given that the length of one of its dimensions is 39.9 cm.
Q19:
Consider the isosceles right triangle, , shown in the figure. Squares have been added to each side of .
Let the area of be one area unit. The areas of the squares on the legs are and , and the area of the square on the hypotenuse is . Find a relationship between the area of the square on the hypotenuse and the areas of the squares on the legs.
- A
- B
- C
- D
- E
Q21:
In the figure below, . Find the area of the shaded square.
Q22:
In the figure below, is a parallelogram in which and . Point is on segment with and . Find the area of .
Q23:
Ancient Egyptians are said to have used ropes to create right angles. The rope was divided into twelve equal lengths with 13 equally spaced knots. The two ends of the rope (knots 1 and 13) were fixed together on the floor. At which two knots should the rope be stretched tight to form a right angle at knot 1?
- Aat knots 3 and 10
- Bat knots 6 and 7
- Cat knots 2 and 11
- Dat knots 4 and 9
- Eat knots 5 and 8
Q24:
A carpenter wishes to construct a trapezoidal prism for the base of a table where the cross section is a regular trapezoid, as seen in the given figure. = 32 inches, = 20 inches, and the perpendicular distance between and is 24 inches.
Work out the length of .
Work out the measure of angle .
If the carpenter then decides to add a strut between and , find the length of .
