GT Maths GT Maths
Hints, Tips and Tricks.
SHAPE and SPACE
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v “When you have looked at my shapes – you can click on the shapes to find their AREAS”
[ TV – Y8 – St.Francis Assisi ] 2d
SHAPES TV
v “You can find out about AREA formulas for different shapes in my presentation”
[ SMC – Y8 – St.Francis Assisi ] AREA SMC
v “I have made a presentation about the properties of some shapes and their areas”
[ JM – Y8 – St.Francis Assisi ] SHAPES JM
v “The EXTERIOR angles round any polygon shape total 360 degrees.
But the total of the INTERIOR angles goes up by 180 degrees every time you add a side (starting with the angles in a triangle that are 180).”
Example : Triangle(3)=180 Quadrilateral(4)=360 Pentagon(5)=540
[ MM and TV – Y8 – St.Francis Assisi ]
v “The total of the interior angles of a polygon can be found by dividing the shape into triangles from a corner,
then (number of sides –2) triangles x180 is the total for the interior angles.”
Example : Hexagon=6sides. 6-2= 4 triangles. 4x180=720 total interior angles.
[ SMC and AR – Y8 – St.Francis Assisi ]
v “To find the interior angle of a regular polygon (with equal angles), just divide the total of the angles by the number of sides”
Example : Pentagon angles total 540. 540/5=108 = the interior angle
[ JM
and JVDH – Y8 - St.Francis Assisi ]
v
“When you are calculating the AREA of a
TRIANGLE, after you have multiplied the base and the vertical height,
don’t forget to divide the answer in half (1/2)”
Example : b=6, h=8 cm, A=(b x h)/2= (6 x 8) /2 = 24/2 = 12 cm^2
[ PH and LB - Y9 – Archbishop Beck ]
v “When you are calculating the AREA of a CIRCLE, you always need to multiply by [ P = pi = 3.142..] “
Example : Radius r=7 cm, A= P x r^2 = pi x r x r = 3.142 x 7 x 7 = 3.142 x 49 = 153.958 cm^2
[ EJ – Y9 – Archbishop Beck ]
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