Problem 1-35 Determine the largest intensity w of the uniform loading on frame when stress is given

This video explains in detail the solution to Problem 1-35 in the Chapter of Stress from the book Mechanics of Materials by R.C. Hibbeler 10th Edition, where, the largest intensity w of the uniform loading that can be applied to the frame is calculated without causing either the average normal stress or the average shear stress at section x-x to exceed by 15MPa and 16MPa, respectively. The cross-sectional area of one member is given.
The solution to Problem 1-35 is available in PDF and can be obtained on request at [e-mail].
Reference: Chapter No. 1 Stress, Mechanics of Materials by R.C. Hibbeler 10th Edition.
For an explanation of any Problem, the request can be made at [e-mail].
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WHY IS THE CROSS SECTION A TRIANGLE

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The cross-section is exactly perpendicular to the QR member. However, the x-x section is not perpendicular to the QR member. Cross-sectional dimensions are given. Therefore, to convert this cross-sectional dimension to that on the x-x section we need to use a right-angled triangle. That's what it is done in this video.