addition
1+1=
2
2-1=
1
a four sided figure with four right angles.
square or rectangle or quadrilateral
1x1
1
2+2=
4
10+10=
20
20-20=
0
an angle less than 90o
acute angle
10x10
100
20+20=
40
134+27
161
100-120=
-20
an angle over 90o but less than 180o
obtuse angle
12x12
200+200=
400
1000+957=
1957
1-100=
-99
a triangle with a right angle
right triangle
100 x 10
1000
2024+2024=
4048
100000+123456=
223456
100000-1000000=
-1000
a triangle with two congruent sides
iososeles triangle
1000 x 1000=
1000000
100000+100000
200000