Numbers and Polygons අංක සහ බහූ අස්ර
(1) A positive integer which has no factors other than 1 and itself is known as a:
prime number
rational number
irrational number
(2) The mathematical name for a polygon with seven sides is a:
hexagon
septagon
heptagon
(3) The mathematical name for the numbers in the sequence: 1, 3, 6, 10, 15, ... is:
square numbers
triangle numbers
Fibonacci numbers
(4) The number of edges on a tetrahedron is:
3
4
6
(5) The mathematical name for a quadrilateral which has exactly one pair of parallel sides is:
a trapezium
a parallelogram
a rhombus
(6) A number which cannot be written as a fraction with integer numerator and denominator is a:
decimal
rational number
irrational number
(7) Which statement applies to any polygon:
the total of the interior angles is 180 degrees,
the total of the exterior angles is 180 degrees
the total of the exterior angles is 360 degrees
(8) If a cuboid is enlarged with a scale factor of 2, what happens to the total surface area?
it is multiplied by 2,
it is multiplied by 4,
it is multiplied by 8.
(9) A triangle has sides of lengths
x
,
y
and
z
. Which of the following statements must be true:
x
+
y
<
z
x
+
y
=
z
x
+
y
>
z
(10) A car travels at an average speed of
x
for the first half of a journey and at an average speed of 3
x
for the second half. What can be said of the average speed for the whole journey?
less than 2
x
,
equal to
x
,
greater than
x
.
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(c) Shilpa Sayura Foundation 2006-2017
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