PLEASE HELP 20 POINTS 1 Which parallelograms have congruent diagonals?

only squares

squares and rectangles

squares and rhombuses

squares, rectangles, and rhombuses

2. Which parallelograns have perpendicular diagonals?

only squares

squares and rectangles

squares and rhombuses

squares, recangles, and rhombuses​

Planet earth has a mass of 5.9726x10²⁴ kg.then: 5.9726x10²⁴ kg=100% of the total earth mass.if the water´s mass=5x10-4 % of the total mass, we can solve this problem by the rule of three.5.9726x10²⁴ %*10⁻⁴ %x=(5.9726x10²³ kg)(5*10⁻⁴  %) / 100 %=2.9863x10¹⁹ kganswer:   the mass of the planet´s water would be   2.9863 x 10¹⁹ kg.