Math formulas

Area

• Circle: S = πR²
• Rectangle: S = ab
• Square: S = a²

Perimeter

• Circle: P = 2πR
• Rectangle: P = 2a + 2b
• Square: P = 4a

Unit Tests

Circle

Test Name	Input	Wanted Result	Result
test_area_zero	r = 0	0	0
test_area	r = 10	π * 10^2 ≈ 314.16	314.16
test_perimeter_zero	r = 0	0	0
test_perimeter	r = 10	2 * π * 10 ≈ 62.83	62.83
test_area_negative	r = -5	Error	-78.54
test_perimeter_negative	r = -5	Error	-31.42
test_area_non_numeric	r = "string"	Error	TypeError
test_perimeter_non_numeric	r = "string"	Error	TypeError
test_area_boolean	r = True	Error	3.14
test_perimeter_boolean	r = True	Error	6.28

Square

Test Name	Input	Wanted Result	Result
test_area_zero	a = 0	0	0
test_area	a = 10	100	100
test_perimeter_zero	a = 0	0	0
test_perimeter	a = 10	40	40
test_area_negative	a = -5	Error	25
test_perimeter_negative	a = -5	Error	-20
test_area_non_numeric	a = "string"	Error	TypeError
test_perimeter_non_numeric	a = "string"	Error	"stringstringstringstring"
test_area_boolean	a = True	Error	1
test_perimeter_boolean	a = True	Error	4

Rectangle

Test Name	Input	Wanted Result	Result
test_area_zero	a = 10, b = 0	0	0
test_area	a = 10, b = 10	100	100
test_perimeter_zero	a = 0, b = 0	0	0
test_perimeter	a = 10, b = 20	60	60
test_area_negative	a = -5, b = 20	Error	-100
test_perimeter_negative	a = -5, b = 20	Error	30
test_area_non_numeric	a = "string", b = 20	Error	'Repeated string output'
test_perimeter_non_numeric	a = "string", b = 20	Error	TypeError
test_area_boolean	a = True, b = 20	Error	20
test_perimeter_boolean	a = True, b = 20	Error	42

Triangle

Test Name	Input	Wanted Result	Result
test_area_zero	a = 10, h = 0	0	0
test_area	a = 10, h = 5	25	25
test_perimeter_zero	a = 0, b = 0, c = 0	0	0
test_perimeter	a = 10, b = 15, c = 20	45	45
test_area_negative	a = -5, h = 5	Error	-12.5
test_perimeter_negative	a = -5, b = 15, c = 20	Error	30
test_area_non_numeric	a = "string", h = 5	Error	TypeError
test_perimeter_non_numeric	a = "string", b = 15, c = 20	Error	TypeError
test_area_boolean	a = True, h = 5	Error	2.5
test_perimeter_boolean	a = True, b = 15, c = 20	Error	36
test_existence	a = 10, b = 50, c = 100	Error	160