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Geometry (Pri-5)

/ Properties of Triangle Marsiling Primary School / Homework (2018)

<The figure shows a right-angled triangle. 10 cm / 24 cm 26 cm A) Find the area of the triangle B) Dinesh wants to cut such triangles from a rectangular piece of cardboard 60cm by 100cm. At most how many such triangles can he cut? <

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January 5, 2018
 
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A) Area of triangle =  $\frac{1}{2}$12  ×10cm×24cm = 120 $cm^2$cm2 

B) 2 triangles form a rectangle with length 24cm and breadth 10cm

100÷24 = 4 R4 

60÷10 =6

Number of rectangles that can be cut = 4 ×6 =24

Number of triangles that can be cut = 24×2= 48

 

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Comments 1
Oct 1, 2018 07:23 AM
IDK whether mine is correct or yours.I have sent a freind request though
January 6, 2018
a) 12 ×10cm×24cm=120cm2b)(60 ×100)÷120=50
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Comments 2
Oct 1, 2018 09:10 AM
Good try Sugiarto, for part B, see the diagram attached to understand why we cannot simply divide the total area by 120 cm^2.
Oct 8, 2018 05:23 AM
Thanks
October 1, 2018
For part B
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October 1, 2018
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