Melaka Trial 2025 Add Maths Paper 2, Question 4Systems of Equations

Solved on video in English · Form 4, Systems of Equations · 5:19 video

The question

Amira wants to make jelly to be given as souvenirs for her wedding by using a mould in the shape of a right prism, as shown in Diagram 2. It is given that the total length of the sides (edges) of the right prism is 75 cm, PT = QU = 13 cm, PQ = QR and UR > QR. Determine whether the mould is suitable to be used for producing jelly with a volume of 155 cm³. Give your justification.

Melaka Trial 2025 Add Maths Paper 2, Question 4: the question as drawn in Eduly's video5:19

Step 1

The right-angled triangular cross-section has perpendicular sides x and y; the slant edges give x² + y² = 13² (Pythagoras).

5 more steps, each with the reason for it, in the full solution

Final answer

Volume = 150 cm³ < 155 cm³, so the mould is not suitable

Where students lose marks

Watch out: UR > QR picks the correct root, and the volume is the triangle's area × the prism's length.

Watch every step of this question solved on video (5:19), with the reason behind each step and a box that checks your own answer.

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