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Gravity
Terms in this set (22)
How do you work out the circumference of a circle?
2 x pi x radius or pi x d
how do you work out the area of a circle?
πr²
how do you find the perimeter of a circle?
2 x pi x radius
how do you work out the circumference of a semi-circle?
2 x pi x radius divided by 2 and add on the diameter
how do you find the area of a semi-circle?
pi x radius squared divided by 2
how do you find the perimeter of a semi-circle?
2 x pi x radius or pi x diameter divided by 2
how do you construct a s.s.s triangle
- draw the longest side using a ruler
-grab the compass and measure the distance with a rule r
- put the compass at one end of the line and draw a arc above the line
- repeat steps 2 and 3 for the other side
- join the ends of the line to the cross to form a triangle
how do you construct a s.a..s triangle?
-draw a line
- grab the protractor and measure the angle by putting o dot on the degree
- draw the line through the degree dot, it does not matter if the line is longer
how do you construct a a.s.a triangle
- draw a line
-grab the portractor and measure the angle and draw a line to meet two point together (left hand side)
- do the same for the right hand side
leave any additional lines on and label
how do you construct a 60 degree angles without a protractor?
-draw a line
- measure out the compass to be the same length as the line
-draw 2 arcs and join to one end of the line
label lines and angle
How to construct a perpendicular bisector
- draw a diagonal line
- set the compass to more than half the length of the drawn line
- place the compass on either end of the line and draw arcs both aove and below the line
-join the two crosses
how to construct a perpendicular line from any point on a line
- draw a diagonal line with a point on it
-place the compass on either ends of the line and draw 2 lines on either side of the dot to form a arc
-use the arcs 'ends of the line' and do the perpendicular bisector
-the final line should be 90 degrees to the original and go through the dot
how to draw aright angle at the end of a line
-draw a diagonal line and extend it using a dashed line
- complete a perpendicular line through a point using the join between the dashed line and drawn line as a point
How do you construct an 'angle bisector?'
-draw 2 lines which create an angle
-using the compass draw 2 arcs which go through the lines
-where there is a cross on the line place the compass on there and for a cross
-join the cross to the middle of the line
how do you construct a locus from ??cm from A?
-draw a dot and label it A
-measure the compass and the amount of cm and draw a circle from A
how do you construct a locus of the points ??cm from the line?
-measure ?? cm above and below the line and horizontally join them so you have 'stacked together'
-measure the radius with the compass and creare a semi-circle from the original to join the top and bottom
-repeat for other side
hoe do you construct a locus of points from ?? and ??
the locus of points is the equidistant from two joining lines is the angle bisector. in this cose locus of all parts is closer to ?? than ?? is the shaded area above the angle bisector
What is the Pythagorean Theorem?
a2+b2=c2 - long side
c2=a2-b2 - sort side
What is the acronym for trigonometry
SOHCAHTOA
what does SOH stand for?
Sin(x) = opp/hyp
What does CAH stand for?
Cos(x) = adj/hyp
What does TOA stand for?
Tan(x) = opp/adj
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