Question 1200815
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Part A


Start by drawing a circle of any size you want.
Then cut it in half, and cut it in half again to get 4 equal slices.


{{{
drawing(400,400,-5,5,-5,5,
circle(0,0,3),
line(-3,0,3,0),
line(0,3,0,-3),

line(-1.75,0.8,-1.75,1.8),
line(-1.75,1.8,-1.25,1.3),
line(-1.25,1.3,-0.75,1.8),
line(-0.75,1.8,-0.75,0.8),

line(0.8,0.8,1.3,1.8),
line(1.3,1.8,1.8,0.8),
line(1.05,1.3,1.55,1.3),

line(-1.25,-1.5,-1.25,-0.5),
line(-1.75,-0.5,-0.75,-0.5),

line(0.8,-1.5,0.8,-0.5),
line(0.8,-0.5,0.8,-1),
line(0.8,-1,1.8,-1),
line(1.8,-1,1.8,-0.5),
line(1.8,-0.5,1.8,-1.5),

locate(-2,4,matrix(1,2,"Figure","A"))

)
}}}
P(M) = 1/4
P(A) = 1/4
P(T) = 1/4
P(H) = 1/4
Add up those probabilities to get 1.
1/4 = 0.25 = 25%


The order of the letters does not matter.



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Part B
Start with the previous drawing. Erase the labels.
{{{
drawing(400,400,-5,5,-5,5,
circle(0,0,3),
line(-3,0,3,0),
line(0,3,0,-3)
)
}}}


Then erase the bottom vertical line and the right-most horizontal line
{{{
drawing(400,400,-5,5,-5,5,
circle(0,0,3),
line(0,0,-3,0),
line(0,0,0,3)
)
}}}
So far we have a 1/4 slice in the upper left corner. 
The remaining chunk is 3/4 of the pizza.


Split the 1/4 slice in half to get two copies of 1/8
(1/4)*(1/2) = 1/8
{{{
drawing(400,400,-5,5,-5,5,
circle(0,0,3),
line(0,0,-3,0),
line(0,0,0,3),
line(0,0,3*cos(135*pi/180),3*sin(135*pi/180))
)
}}}


Then be sure to label the appropriate regions.
{{{
drawing(400,400,-5,5,-5,5,
circle(0,0,3),
line(0,0,-3,0),
line(0,0,0,3),

line(0,0,3*cos(135*pi/180),3*sin(135*pi/180)),

line(0.8,-1.5,0.8,-0.5),
line(0.8,-0.5,0.8,-1),
line(0.8,-1,1.3,-1),
line(1.3,-1,1.6,-1.5),
arc(0.25+0.8,0.75-1.5,0.70711,0.70711,225,405),

line(-2.38,0.21,-1.88,1.21),
line(-1.88,1.21,-1.38,0.21),
line(-2.13,0.71,-1.63,0.71),

line(-0.52-0.25,1.91-0.5,-0.52-0.25,2.91-0.5),
line(-1.02-0.25,2.91-0.5,-0.02-0.25,2.91-0.5),

locate(-2,4,matrix(1,2,"Figure","B"))
)
}}}
P(R) = 3/4 = 0.75
P(A) = 1/8 = 0.125
P(T) = 1/8 = 0.125
Add up those probabilities to get 1.
The order of the "A" and "T" does not matter.


Side note: 3/4 = 6/8
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