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shapes:
square
rectangle
triangle
circle
π=3.143.14153.141592
/ formulas
cm (1)half cm (0.5)mm (0.1)
exercise:
perimeter
also for triangles
area
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formulas

square

rectangle

triangle

circle
perimeter S + S + S + S
4 • S		 W + H + W + H
2 • W + 2 • H		 S1 + S2* + S3* 2 • π • R
area S • S
S2		 W • H (W • H) / 2 π • R2
*) Use the Pythagoras Theorem to calculate triangle side lengths (a2 + b2 = c2).