Maths Olympiad Prep

Library / UKMT Grey Kangaroo /192 of 242

UKMT Grey Kangaroo, 2023

Geometry Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

The diagram shows a smaller rectangle made from three squares, each of area 25 cm225\text{ cm}^2, inside a larger rectangle. Two of the vertices of the smaller rectangle lie on the mid-points of the shorter sides of the larger rectangle. The other two vertices of the smaller rectangle lie on the other two sides of the larger rectangle. What is the area, in cm2\text{cm}^2, of the larger rectangle?

(A) 125125 (B) 136136 (C) 149149 (D) 150150 (E) 172172

Figure for this problem

We don't reproduce this publisher's solutions. Their own solution is here — work the problem first.
Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.