added volume Hemisphere

mathgenerator/funcs/geometry/volume_hemisphere.py

@@ -0,0 +1,19 @@
+from .__init__ import *
+
+
+def gen_func(maxRadius=100, format='string'):
+    r = random.randint(1, maxRadius)
+    ans = round((2 * math.pi / 3) * r**3, 3)
+
+    if format == 'string':
+        problem = f"Volume of hemisphere with radius {r} m = "
+        solution = f"{ans} m^3"
+        return problem, solution
+    elif format == 'latex':
+        return "Latex unavailable"
+    else:
+        return r, ans
+
+
+volume_sphere = Generator("Volume of Hemisphere", 61, gen_func,
+                          ["maxRadius=100"])