MATHEMATICS GRADE 9 FORMAL ASSESSMENT TASK (FAT) 3.1:
PROJECT
Total: 60 Marks
Time: 1 period
MEMORANDUM
Important Information
• This is a marking guideline. In instances where learners have used different but mathematically sound
strategies to solve the problems, they (learners) should be credited.
• Unless otherwise stated, learners who give a correct answer only, should be awarded full marks.
• Underline errors committed by learners and apply Consistent Accuracy (CA) marking.
Question 1:
1.1 Area triangle: Area = ½ bh
(3)
= ½ X 32 X 20 mm
= 320 mm2
1.2 Area Circle: Area =
(3)
π r2
= 3,142 x 92 mm
= 254,5 mm2 
1.3 Area Rectangle: Area = l x b
(3)
= 15 x 13 mm
= 195 mm2 
1.4 Area of triangle is largest
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(1)
Question 2:
2.1
10cm
4cm
8cm
2.2 Volume = ½ b x h x d
= ½ x 8 x 4 x 10
= 160cm3 
2.3 160cm3 = 0,00016m3 = 160 000 mm3 
Question 3:
3.1 Vol = π r2 h
= 3,14 x 3,52 x 5
= 192,33m3 =
3.2 192 330 litres
3.3 Vol prism = l xb x h
= 10 x 3 x 5
= 150 m3
Vol Triangular prism = ½ l x b x h
= ½ x 10 x 5 x 3
= 75m3
Total volume = 150m3  + 75 m3
= 225m3 
3.4 Surface area Rect prism to be painted:
= 2(lxh) + 2(bxh)
= 2(8 x 3)  + 2( 5 x 3) 
= 48 
+ 30
= 78m2
Surface area of triangular prism to be painted
= 2(l x b) + 2( ½ b x h)
= 2( 5 x 5)  + 2 ( ½ x 8 x 3) 
= 50  + 24
= 74m2
Total surface area = 78 + 74m2
= 152m2
3.5 152m2 ÷5 = 30,4 litres R110 x 30,4 litres = R3 344,00
This study source was downloaded by 100000786683541 from CourseHero.com on 09-11-2022 17:24:52 GMT -05:00
https://www.coursehero.com/file/52836862/MATHEMATICS-GRADE-9-FAT-31-Project-MEMORANDUMdocx/
Question 4:
Area of cube = 6 a2
= 6 x 32
= 54m2
This study source was downloaded by 100000786683541 from CourseHero.com on 09-11-2022 17:24:52 GMT -05:00
https://www.coursehero.com/file/52836862/MATHEMATICS-GRADE-9-FAT-31-Project-MEMORANDUMdocx/
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